1650755993 has 4 divisors (see below), whose sum is σ = 1650859188. Its totient is φ = 1650652800.

The previous prime is 1650755989. The next prime is 1650756013. The reversal of 1650755993 is 3995570561.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1231448464 + 419307529 = 35092^2 + 20477^2 .

It is a cyclic number.

It is not a de Polignac number, because 1650755993 - 2² = 1650755989 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1650755593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21908 + ... + 61493.

It is an arithmetic number, because the mean of its divisors is an integer number (412714797).

Almost surely, 2^1650755993 is an apocalyptic number.

It is an amenable number.

1650755993 is a deficient number, since it is larger than the sum of its proper divisors (103195).

1650755993 is an equidigital number, since it uses as much as digits as its factorization.

1650755993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103194.

The product of its (nonzero) digits is 1275750, while the sum is 50.

The square root of 1650755993 is about 40629.4965880701. The cubic root of 1650755993 is about 1181.8461938282.

The spelling of 1650755993 in words is "one billion, six hundred fifty million, seven hundred fifty-five thousand, nine hundred ninety-three".