55187257851 has 24 divisors (see below), whose sum is σ = 90182549184. Its totient is φ = 33446821320.

The previous prime is 55187257847. The next prime is 55187257859. The reversal of 55187257851 is 15875278155.

55187257851 is a `hidden beast` number, since 5 + 5 + 18 + 7 + 2 + 578 + 51 = 666.

It is not a de Polignac number, because 55187257851 - 2² = 55187257847 is a prime.

It is a super-2 number, since 2×55187257851² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55187257859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10320421 + ... + 10325766.

It is an arithmetic number, because the mean of its divisors is an integer number (3757606216).

Almost surely, 2^55187257851 is an apocalyptic number.

55187257851 is a deficient number, since it is larger than the sum of its proper divisors (34995291333).

55187257851 is a wasteful number, since it uses less digits than its factorization.

55187257851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20646213 (or 20646201 counting only the distinct ones).

The product of its digits is 3920000, while the sum is 54.

The spelling of 55187257851 in words is "fifty-five billion, one hundred eighty-seven million, two hundred fifty-seven thousand, eight hundred fifty-one".