51231316356 has 144 divisors (see below), whose sum is σ = 144690489216. Its totient is φ = 15153600000.

The previous prime is 51231316303. The next prime is 51231316361. The reversal of 51231316356 is 65361313215.

51231316356 is a `hidden beast` number, since 5 + 1 + 2 + 3 + 13 + 1 + 635 + 6 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51231316356.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2830696 + ... + 2848736.

It is an arithmetic number, because the mean of its divisors is an integer number (1004795064).

Almost surely, 2^51231316356 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 51231316356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72345244608).

51231316356 is an abundant number, since it is smaller than the sum of its proper divisors (93459172860).

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

51231316356 is a wasteful number, since it uses less digits than its factorization.

51231316356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18234 (or 18229 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The spelling of 51231316356 in words is "fifty-one billion, two hundred thirty-one million, three hundred sixteen thousand, three hundred fifty-six".