56643388621 has 24 divisors (see below), whose sum is σ = 59746934016. Its totient is φ = 53694696000.

The previous prime is 56643388619. The next prime is 56643388631. The reversal of 56643388621 is 12688334665.

It is not a de Polignac number, because 56643388621 - 2¹ = 56643388619 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 (56643388631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29608761 + ... + 29610673.

It is an arithmetic number, because the mean of its divisors is an integer number (2489455584).

Almost surely, 2^56643388621 is an apocalyptic number.

It is an amenable number.

56643388621 is a deficient number, since it is larger than the sum of its proper divisors (3103545395).

56643388621 is a wasteful number, since it uses less digits than its factorization.

56643388621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2433 (or 2410 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 52.

The spelling of 56643388621 in words is "fifty-six billion, six hundred forty-three million, three hundred eighty-eight thousand, six hundred twenty-one".