56510221157 has 32 divisors (see below), whose sum is σ = 63893491200. Its totient is φ = 49631777280.

The previous prime is 56510221139. The next prime is 56510221177. The reversal of 56510221157 is 75112201565.

It is a cyclic number.

It is not a de Polignac number, because 56510221157 - 2⁶ = 56510221093 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 (56510221177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7336094 + ... + 7343792.

It is an arithmetic number, because the mean of its divisors is an integer number (1996671600).

Almost surely, 2^56510221157 is an apocalyptic number.

It is an amenable number.

56510221157 is a deficient number, since it is larger than the sum of its proper divisors (7383270043).

56510221157 is a wasteful number, since it uses less digits than its factorization.

56510221157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8093.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 56510221157 in words is "fifty-six billion, five hundred ten million, two hundred twenty-one thousand, one hundred fifty-seven".