56502165221 has 16 divisors (see below), whose sum is σ = 59087646720. Its totient is φ = 53966605440.

The previous prime is 56502165197. The next prime is 56502165229. The reversal of 56502165221 is 12256120565.

It is not a de Polignac number, because 56502165221 - 2⁶ = 56502165157 is a prime.

It is a super-2 number, since 2×56502165221² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56502165229) 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, 1518380 + ... + 1555146.

It is an arithmetic number, because the mean of its divisors is an integer number (3692977920).

Almost surely, 2^56502165221 is an apocalyptic number.

It is an amenable number.

56502165221 is a deficient number, since it is larger than the sum of its proper divisors (2585481499).

56502165221 is a wasteful number, since it uses less digits than its factorization.

56502165221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37444.

The product of its (nonzero) digits is 36000, while the sum is 35.

Adding to 56502165221 its reverse (12256120565), we get a palindrome (68758285786).

The spelling of 56502165221 in words is "fifty-six billion, five hundred two million, one hundred sixty-five thousand, two hundred twenty-one".