51438986316 has 36 divisors (see below), whose sum is σ = 131366813032. Its totient is φ = 16969561344.

The previous prime is 51438986303. The next prime is 51438986317. The reversal of 51438986316 is 61368983415.

51438986316 is a `hidden beast` number, since 51 + 438 + 98 + 63 + 16 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (51438986317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7361770 + ... + 7368753.

Almost surely, 2^51438986316 is an apocalyptic number.

It is an amenable number.

51438986316 is an abundant number, since it is smaller than the sum of its proper divisors (79927826716).

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

51438986316 is a wasteful number, since it uses less digits than its factorization.

51438986316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14730630 (or 14730625 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 54.

The spelling of 51438986316 in words is "fifty-one billion, four hundred thirty-eight million, nine hundred eighty-six thousand, three hundred sixteen".