56155561660 has 48 divisors (see below), whose sum is σ = 129921073632. Its totient is φ = 20218016000.

The previous prime is 56155561591. The next prime is 56155561669. The reversal of 56155561660 is 6616555165.

It is a self number, because there is not a number n which added to its sum of digits gives 56155561660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56155561669) 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 15 ways as a sum of consecutive naturals, for example, 1241407 + ... + 1285846.

It is an arithmetic number, because the mean of its divisors is an integer number (2706689034).

Almost surely, 2^56155561660 is an apocalyptic number.

It is an amenable number.

56155561660 is an abundant number, since it is smaller than the sum of its proper divisors (73765511972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56155561660 is a wasteful number, since it uses less digits than its factorization.

56155561660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527374 (or 2527372 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 56155561660 in words is "fifty-six billion, one hundred fifty-five million, five hundred sixty-one thousand, six hundred sixty".