56662565521 has 3 divisors (see below), whose sum is σ = 56662803561. Its totient is φ = 56662327482.

The previous prime is 56662565503. The next prime is 56662565539. The reversal of 56662565521 is 12556526665.

The square root of 56662565521 is 238039.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (56662565503) and next prime (56662565539).

It is not a de Polignac number, because 56662565521 - 2²¹ = 56660468369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56662565551) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 119020 + ... + 357058.

It is an arithmetic number, because the mean of its divisors is an integer number (18887601187).

Almost surely, 2^56662565521 is an apocalyptic number.

56662565521 is the 238039-th square number.

56662565521 is the 119020-th centered octagonal number.

It is an amenable number.

56662565521 is a deficient number, since it is larger than the sum of its proper divisors (238040).

56662565521 is an frugal number, since it uses more digits than its factorization.

56662565521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 476078 (or 238039 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 49.

Multiplying 56662565521 by its sum of digits (49), we get a square (2776465710529 = 1666273²).

The spelling of 56662565521 in words is "fifty-six billion, six hundred sixty-two million, five hundred sixty-five thousand, five hundred twenty-one".