56757720507 has 4 divisors (see below), whose sum is σ = 75676960680. Its totient is φ = 37838480336.

The previous prime is 56757720443. The next prime is 56757720521. The reversal of 56757720507 is 70502775765.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56757720507 - 2⁶ = 56757720443 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56757720507.

It is not an unprimeable number, because it can be changed into a prime (56757720577) by changing a digit.

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, 9459620082 + ... + 9459620087.

It is an arithmetic number, because the mean of its divisors is an integer number (18919240170).

Almost surely, 2^56757720507 is an apocalyptic number.

56757720507 is a deficient number, since it is larger than the sum of its proper divisors (18919240173).

56757720507 is a wasteful number, since it uses less digits than its factorization.

56757720507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18919240172.

The product of its (nonzero) digits is 3601500, while the sum is 51.

The spelling of 56757720507 in words is "fifty-six billion, seven hundred fifty-seven million, seven hundred twenty thousand, five hundred seven".