55661812018038 has 24 divisors (see below), whose sum is σ = 121550203676928. Its totient is φ = 18407843343792.

The previous prime is 55661812018037. The next prime is 55661812018097. The reversal of 55661812018038 is 83081021816655.

55661812018038 is a `hidden beast` number, since 5 + 5 + 6 + 618 + 1 + 2 + 0 + 18 + 0 + 3 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55661812018037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12174497281 + ... + 12174501852.

It is an arithmetic number, because the mean of its divisors is an integer number (5064591819872).

Almost surely, 2^{55661812018038} is an apocalyptic number.

55661812018038 is an abundant number, since it is smaller than the sum of its proper divisors (65888391658890).

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

55661812018038 is a wasteful number, since it uses less digits than its factorization.

55661812018038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24348999268 (or 24348999265 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 54.

The spelling of 55661812018038 in words is "fifty-five trillion, six hundred sixty-one billion, eight hundred twelve million, eighteen thousand, thirty-eight".