55518851871 has 64 divisors (see below), whose sum is σ = 95858380800. Its totient is φ = 31098981888.

The previous prime is 55518851831. The next prime is 55518851897. The reversal of 55518851871 is 17815881555.

55518851871 is a `hidden beast` number, since 5 + 5 + 51 + 8 + 8 + 518 + 71 = 666.

It is not a de Polignac number, because 55518851871 - 2²² = 55514657567 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55518851831) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17798650 + ... + 17801768.

It is an arithmetic number, because the mean of its divisors is an integer number (1497787200).

Almost surely, 2^55518851871 is an apocalyptic number.

55518851871 is a deficient number, since it is larger than the sum of its proper divisors (40339528929).

55518851871 is a wasteful number, since it uses less digits than its factorization.

55518851871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965 (or 4959 counting only the distinct ones).

The product of its digits is 2240000, while the sum is 54.

The spelling of 55518851871 in words is "fifty-five billion, five hundred eighteen million, eight hundred fifty-one thousand, eight hundred seventy-one".