51855180831 has 8 divisors (see below), whose sum is σ = 76822490160. Its totient is φ = 34570120536.

The previous prime is 51855180829. The next prime is 51855180847. The reversal of 51855180831 is 13808155815.

51855180831 is a `hidden beast` number, since 5 + 18 + 551 + 8 + 0 + 83 + 1 = 666.

It is not a de Polignac number, because 51855180831 - 2¹ = 51855180829 is a prime.

It is a super-2 number, since 2×51855180831² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51855180851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 960281100 + ... + 960281153.

It is an arithmetic number, because the mean of its divisors is an integer number (9602811270).

Almost surely, 2^51855180831 is an apocalyptic number.

51855180831 is a deficient number, since it is larger than the sum of its proper divisors (24967309329).

51855180831 is a wasteful number, since it uses less digits than its factorization.

51855180831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920562262 (or 1920562256 counting only the distinct ones).

The product of its (nonzero) digits is 192000, while the sum is 45.

The spelling of 51855180831 in words is "fifty-one billion, eight hundred fifty-five million, one hundred eighty thousand, eight hundred thirty-one".