56640232600221 has 4 divisors (see below), whose sum is σ = 75520310133632. Its totient is φ = 37760155066812.

The previous prime is 56640232600181. The next prime is 56640232600247. The reversal of 56640232600221 is 12200623204665.

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 not a de Polignac number, because 56640232600221 - 2⁶ = 56640232600157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 56640232600221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640232600291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9440038766701 + ... + 9440038766706.

It is an arithmetic number, because the mean of its divisors is an integer number (18880077533408).

Almost surely, 2^{56640232600221} is an apocalyptic number.

It is an amenable number.

56640232600221 is a deficient number, since it is larger than the sum of its proper divisors (18880077533411).

56640232600221 is a wasteful number, since it uses less digits than its factorization.

56640232600221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18880077533410.

The product of its (nonzero) digits is 207360, while the sum is 39.

Adding to 56640232600221 its reverse (12200623204665), we get a palindrome (68840855804886).

The spelling of 56640232600221 in words is "fifty-six trillion, six hundred forty billion, two hundred thirty-two million, six hundred thousand, two hundred twenty-one".