51123938816 has 40 divisors (see below), whose sum is σ = 102481071000. Its totient is φ = 25478627328.

The previous prime is 51123938809. The next prime is 51123938851. The reversal of 51123938816 is 61883932115.

It is a super-2 number, since 2×51123938816² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5441 + ... + 319808.

It is an arithmetic number, because the mean of its divisors is an integer number (2562026775).

Almost surely, 2^51123938816 is an apocalyptic number.

It is an amenable number.

51123938816 is an abundant number, since it is smaller than the sum of its proper divisors (51357132184).

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

51123938816 is an equidigital number, since it uses as much as digits as its factorization.

51123938816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325574 (or 325558 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

It can be divided in two parts, 511239 and 38816, that added together give a palindrome (550055).

The spelling of 51123938816 in words is "fifty-one billion, one hundred twenty-three million, nine hundred thirty-eight thousand, eight hundred sixteen".