56612021665 has 8 divisors (see below), whose sum is σ = 67935704040. Its totient is φ = 45288765312.

The previous prime is 56612021621. The next prime is 56612021671.

56612021665 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 1405350144 + 55206671521 = 37488^2 + 234961^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 56612021665 - 2²⁵ = 56578467233 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 454371 + ... + 565399.

It is an arithmetic number, because the mean of its divisors is an integer number (8491963005).

Almost surely, 2^56612021665 is an apocalyptic number.

It is an amenable number.

56612021665 is a deficient number, since it is larger than the sum of its proper divisors (11323682375).

56612021665 is a wasteful number, since it uses less digits than its factorization.

56612021665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213011.

The product of its (nonzero) digits is 129600, while the sum is 40.

It can be divided in two parts, 566120 and 21665, that added together give a palindrome (587785).

The spelling of 56612021665 in words is "fifty-six billion, six hundred twelve million, twenty-one thousand, six hundred sixty-five".