7121795845 has 4 divisors (see below), whose sum is σ = 8546155020. Its totient is φ = 5697436672.

The previous prime is 7121795833. The next prime is 7121795867. The reversal of 7121795845 is 5485971217.

7121795845 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5485971217 = 59 ⋅92982563.

It can be written as a sum of positive squares in 2 ways, for example, as 728514081 + 6393281764 = 26991^2 + 79958^2 .

It is a cyclic number.

It is not a de Polignac number, because 7121795845 - 2⁷ = 7121795717 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 712179580 + ... + 712179589.

It is an arithmetic number, because the mean of its divisors is an integer number (2136538755).

Almost surely, 2^7121795845 is an apocalyptic number.

It is an amenable number.

7121795845 is a deficient number, since it is larger than the sum of its proper divisors (1424359175).

7121795845 is a wasteful number, since it uses less digits than its factorization.

7121795845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424359174.

The product of its digits is 705600, while the sum is 49.

The square root of 7121795845 is about 84390.7331701769. The cubic root of 7121795845 is about 1923.9620734027.

The spelling of 7121795845 in words is "seven billion, one hundred twenty-one million, seven hundred ninety-five thousand, eight hundred forty-five".