51691155024 has 40 divisors (see below), whose sum is σ = 135724597792. Its totient is φ = 16947918720.

The previous prime is 51691154993. The next prime is 51691155031. The reversal of 51691155024 is 42055119615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8824114 + ... + 8829969.

Almost surely, 2^51691155024 is an apocalyptic number.

It is an amenable number.

51691155024 is an abundant number, since it is smaller than the sum of its proper divisors (84033442768).

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

51691155024 is a wasteful number, since it uses less digits than its factorization.

51691155024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17654155 (or 17654149 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 39.

The spelling of 51691155024 in words is "fifty-one billion, six hundred ninety-one million, one hundred fifty-five thousand, twenty-four".