56905556643 has 64 divisors (see below), whose sum is σ = 96445888000. Its totient is φ = 32870924928.

The previous prime is 56905556633. The next prime is 56905556647. The reversal of 56905556643 is 34665550965.

It is not a de Polignac number, because 56905556643 - 2⁸ = 56905556387 is a prime.

It is a super-3 number, since 3×56905556643³ (a number of 33 digits) contains 333 as substring.

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 56905556643.

It is not an unprimeable number, because it can be changed into a prime (56905556647) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 687780 + ... + 766062.

It is an arithmetic number, because the mean of its divisors is an integer number (1506967000).

Almost surely, 2^56905556643 is an apocalyptic number.

56905556643 is a deficient number, since it is larger than the sum of its proper divisors (39540331357).

56905556643 is a wasteful number, since it uses less digits than its factorization.

56905556643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78433 (or 78427 counting only the distinct ones).

The product of its (nonzero) digits is 14580000, while the sum is 54.

The spelling of 56905556643 in words is "fifty-six billion, nine hundred five million, five hundred fifty-six thousand, six hundred forty-three".