55561810860 has 72 divisors (see below), whose sum is σ = 168996924096. Its totient is φ = 14776093440.

The previous prime is 55561810859. The next prime is 55561810867. The reversal of 55561810860 is 6801816555.

55561810860 is a `hidden beast` number, since 5 + 5 + 561 + 8 + 1 + 0 + 86 + 0 = 666.

It is a super-2 number, since 2×55561810860² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (55561810867) 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, 354481 + ... + 486600.

Almost surely, 2^55561810860 is an apocalyptic number.

It is an amenable number.

55561810860 is an abundant number, since it is smaller than the sum of its proper divisors (113435113236).

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

55561810860 is a wasteful number, since it uses less digits than its factorization.

55561810860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841463 (or 841458 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 45.

The spelling of 55561810860 in words is "fifty-five billion, five hundred sixty-one million, eight hundred ten thousand, eight hundred sixty".