51331700864 has 32 divisors (see below), whose sum is σ = 104756587740. Its totient is φ = 25039851520.

The previous prime is 51331700851. The next prime is 51331700869. The reversal of 51331700864 is 46800713315.

51331700864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 50718643264 + 613057600 = 225208^2 + 24760^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (51331700869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4885349 + ... + 4895844.

Almost surely, 2^51331700864 is an apocalyptic number.

It is an amenable number.

51331700864 is an abundant number, since it is smaller than the sum of its proper divisors (53424886876).

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

51331700864 is an equidigital number, since it uses as much as digits as its factorization.

51331700864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9781248 (or 9781236 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 51331700864 in words is "fifty-one billion, three hundred thirty-one million, seven hundred thousand, eight hundred sixty-four".