51855171885 has 48 divisors (see below), whose sum is σ = 99660907008. Its totient is φ = 24729724800.

The previous prime is 51855171853. The next prime is 51855171889. The reversal of 51855171885 is 58817155815.

51855171885 is a `hidden beast` number, since 5 + 1 + 8 + 551 + 7 + 1 + 8 + 85 = 666.

It is not a de Polignac number, because 51855171885 - 2⁵ = 51855171853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855171889) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 828477 + ... + 888866.

It is an arithmetic number, because the mean of its divisors is an integer number (2076268896).

Almost surely, 2^51855171885 is an apocalyptic number.

51855171885 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51855171885 is a deficient number, since it is larger than the sum of its proper divisors (47805735123).

51855171885 is a wasteful number, since it uses less digits than its factorization.

51855171885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1717426 (or 1717423 counting only the distinct ones).

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

The spelling of 51855171885 in words is "fifty-one billion, eight hundred fifty-five million, one hundred seventy-one thousand, eight hundred eighty-five".