55661812018050 has 48 divisors (see below), whose sum is σ = 157761478636992. Its totient is φ = 12722699889600.

The previous prime is 55661812018037. The next prime is 55661812018097. The reversal of 55661812018050 is 5081021816655.

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, 26505623721 + ... + 26505625820.

It is an arithmetic number, because the mean of its divisors is an integer number (3286697471604).

Almost surely, 2^{55661812018050} is an apocalyptic number.

55661812018050 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55661812018050 is an abundant number, since it is smaller than the sum of its proper divisors (102099666618942).

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

55661812018050 is a wasteful number, since it uses less digits than its factorization.

55661812018050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53011249563 (or 53011249558 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 48.

The spelling of 55661812018050 in words is "fifty-five trillion, six hundred sixty-one billion, eight hundred twelve million, eighteen thousand, fifty".