51986813968 has 10 divisors (see below), whose sum is σ = 100724452094. Its totient is φ = 25993406976.

The previous prime is 51986813951. The next prime is 51986813971. The reversal of 51986813968 is 86931868915.

It can be written as a sum of positive squares in only one way, i.e., 43692704784 + 8294109184 = 209028^2 + 91072^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1624587921 + ... + 1624587952.

Almost surely, 2^51986813968 is an apocalyptic number.

It is an amenable number.

51986813968 is a deficient number, since it is larger than the sum of its proper divisors (48737638126).

51986813968 is a wasteful number, since it uses less digits than its factorization.

51986813968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249175881 (or 3249175875 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 64.

The spelling of 51986813968 in words is "fifty-one billion, nine hundred eighty-six million, eight hundred thirteen thousand, nine hundred sixty-eight".