51494939983980 has 72 divisors (see below), whose sum is σ = 156202086414192. Its totient is φ = 13731916438656.

The previous prime is 51494939983979. The next prime is 51494939983999. The reversal of 51494939983980 is 8938993949415.

51494939983980 is a `hidden beast` number, since 5 + 1 + 4 + 9 + 493 + 9 + 98 + 39 + 8 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51494939983980.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43772022 + ... + 44933058.

Almost surely, 2^{51494939983980} is an apocalyptic number.

It is an amenable number.

51494939983980 is an abundant number, since it is smaller than the sum of its proper divisors (104707146430212).

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

51494939983980 is a wasteful number, since it uses less digits than its factorization.

51494939983980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1407455 (or 1407450 counting only the distinct ones).

The product of its (nonzero) digits is 2720977920, while the sum is 81.

The spelling of 51494939983980 in words is "fifty-one trillion, four hundred ninety-four billion, nine hundred thirty-nine million, nine hundred eighty-three thousand, nine hundred eighty".