55721000106 has 48 divisors (see below), whose sum is σ = 122783653824. Its totient is φ = 18258685632.

The previous prime is 55721000099. The next prime is 55721000213. The reversal of 55721000106 is 60100012755.

55721000106 is a `hidden beast` number, since 557 + 2 + 1 + 0 + 0 + 0 + 106 = 666.

It is a super-2 number, since 2×55721000106² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55721000106.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539886 + ... + 634758.

It is an arithmetic number, because the mean of its divisors is an integer number (2557992788).

Almost surely, 2^55721000106 is an apocalyptic number.

55721000106 is an abundant number, since it is smaller than the sum of its proper divisors (67062653718).

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

55721000106 is a wasteful number, since it uses less digits than its factorization.

55721000106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95435 (or 95432 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The spelling of 55721000106 in words is "fifty-five billion, seven hundred twenty-one million, one hundred six", and thus it is an aban number.