765053856421 has 4 divisors (see below), whose sum is σ = 765239959744. Its totient is φ = 764867753100.

The previous prime is 765053856401. The next prime is 765053856451. The reversal of 765053856421 is 124658350567.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 765053856421 - 2⁵ = 765053856389 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 (765053856401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93045495 + ... + 93053716.

It is an arithmetic number, because the mean of its divisors is an integer number (191309989936).

Almost surely, 2^765053856421 is an apocalyptic number.

It is an amenable number.

765053856421 is a deficient number, since it is larger than the sum of its proper divisors (186103323).

765053856421 is a wasteful number, since it uses less digits than its factorization.

765053856421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186103322.

The product of its (nonzero) digits is 6048000, while the sum is 52.

The spelling of 765053856421 in words is "seven hundred sixty-five billion, fifty-three million, eight hundred fifty-six thousand, four hundred twenty-one".