55457890220 has 24 divisors (see below), whose sum is σ = 116614639008. Its totient is φ = 22154000000.

The previous prime is 55457890193. The next prime is 55457890249. The reversal of 55457890220 is 2209875455.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806656 + ... + 1837095.

It is an arithmetic number, because the mean of its divisors is an integer number (4858943292).

Almost surely, 2^55457890220 is an apocalyptic number.

It is an amenable number.

55457890220 is an abundant number, since it is smaller than the sum of its proper divisors (61156748788).

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

55457890220 is a wasteful number, since it uses less digits than its factorization.

55457890220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3644521 (or 3644519 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 47.

The spelling of 55457890220 in words is "fifty-five billion, four hundred fifty-seven million, eight hundred ninety thousand, two hundred twenty".