51139150981056 has 336 divisors, whose sum is σ = 154917657838944. Its totient is φ = 16720492179456.

The previous prime is 51139150981049. The next prime is 51139150981091. The reversal of 51139150981056 is 65018905193115.

51139150981056 is a `hidden beast` number, since 5 + 1 + 1 + 3 + 9 + 1 + 509 + 81 + 0 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 51139150980993 and 51139150981011.

It is a congruent number.

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, 5965136386 + ... + 5965144958.

It is an arithmetic number, because the mean of its divisors is an integer number (461064457854).

Almost surely, 2^{51139150981056} 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 51139150981056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77458828919472).

51139150981056 is an abundant number, since it is smaller than the sum of its proper divisors (103778506857888).

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

51139150981056 is an equidigital number, since it uses as much as digits as its factorization.

51139150981056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15890 (or 15868 counting only the distinct ones).

The product of its (nonzero) digits is 1458000, while the sum is 54.

The spelling of 51139150981056 in words is "fifty-one trillion, one hundred thirty-nine billion, one hundred fifty million, nine hundred eighty-one thousand, fifty-six".