51347670664 has 8 divisors (see below), whose sum is σ = 96276882510. Its totient is φ = 25673835328.

The previous prime is 51347670653. The next prime is 51347670691. The reversal of 51347670664 is 46607674315.

51347670664 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 only one way, i.e., 43371394564 + 7976276100 = 208258^2 + 89310^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3209229409 + ... + 3209229424.

Almost surely, 2^51347670664 is an apocalyptic number.

It is an amenable number.

51347670664 is a deficient number, since it is larger than the sum of its proper divisors (44929211846).

51347670664 is a wasteful number, since it uses less digits than its factorization.

51347670664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6418458839 (or 6418458835 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 51347670664 in words is "fifty-one billion, three hundred forty-seven million, six hundred seventy thousand, six hundred sixty-four".