51731361168 has 80 divisors (see below), whose sum is σ = 139560817536. Its totient is φ = 16480921600.

The previous prime is 51731361167. The next prime is 51731361169. The reversal of 51731361168 is 86116313715.

51731361168 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51731361167) and next prime (51731361169).

It is a super-2 number, since 2×51731361168² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51731361163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1418296 + ... + 1454312.

Almost surely, 2^51731361168 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51731361168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69780408768).

51731361168 is an abundant number, since it is smaller than the sum of its proper divisors (87829456368).

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

51731361168 is a wasteful number, since it uses less digits than its factorization.

51731361168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37352 (or 37346 counting only the distinct ones).

The product of its digits is 90720, while the sum is 42.

The spelling of 51731361168 in words is "fifty-one billion, seven hundred thirty-one million, three hundred sixty-one thousand, one hundred sixty-eight".