6601765889 has 4 divisors (see below), whose sum is σ = 6603142356. Its totient is φ = 6600389424.

The previous prime is 6601765879. The next prime is 6601765901. The reversal of 6601765889 is 9885671066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9885671066 = 2 ⋅4942835533.

It can be written as a sum of positive squares in 2 ways, for example, as 3215457025 + 3386308864 = 56705^2 + 58192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6601765889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6601765879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681014 + ... + 690639.

It is an arithmetic number, because the mean of its divisors is an integer number (1650785589).

Almost surely, 2^6601765889 is an apocalyptic number.

It is an amenable number.

6601765889 is a deficient number, since it is larger than the sum of its proper divisors (1376467).

6601765889 is a wasteful number, since it uses less digits than its factorization.

6601765889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376466.

The product of its (nonzero) digits is 4354560, while the sum is 56.

The square root of 6601765889 is about 81251.2516149751. The cubic root of 6601765889 is about 1875.9447341243.

The spelling of 6601765889 in words is "six billion, six hundred one million, seven hundred sixty-five thousand, eight hundred eighty-nine".