765256040639 has 16 divisors (see below), whose sum is σ = 788679327744. Its totient is φ = 742065854400.

The previous prime is 765256040617. The next prime is 765256040669. The reversal of 765256040639 is 936040652567.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-765256040639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765256040669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9537362 + ... + 9617264.

It is an arithmetic number, because the mean of its divisors is an integer number (49292457984).

Almost surely, 2^765256040639 is an apocalyptic number.

765256040639 is a deficient number, since it is larger than the sum of its proper divisors (23423287105).

765256040639 is a wasteful number, since it uses less digits than its factorization.

765256040639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81358.

The product of its (nonzero) digits is 8164800, while the sum is 53.

The spelling of 765256040639 in words is "seven hundred sixty-five billion, two hundred fifty-six million, forty thousand, six hundred thirty-nine".