56655561621 has 8 divisors (see below), whose sum is σ = 75555880000. Its totient is φ = 37762808832.

The previous prime is 56655561617. The next prime is 56655561629. The reversal of 56655561621 is 12616555665.

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

It is not a de Polignac number, because 56655561621 - 2² = 56655561617 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 (56655561629) by changing a digit.

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, 1873900 + ... + 1903893.

It is an arithmetic number, because the mean of its divisors is an integer number (9444485000).

Almost surely, 2^56655561621 is an apocalyptic number.

It is an amenable number.

56655561621 is a deficient number, since it is larger than the sum of its proper divisors (18900318379).

56655561621 is a wasteful number, since it uses less digits than its factorization.

56655561621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3782795.

The product of its digits is 1620000, while the sum is 48.

The spelling of 56655561621 in words is "fifty-six billion, six hundred fifty-five million, five hundred sixty-one thousand, six hundred twenty-one".