51061110664 has 8 divisors (see below), whose sum is σ = 95739582510. Its totient is φ = 25530555328.

The previous prime is 51061110649. The next prime is 51061110671. The reversal of 51061110664 is 46601116015.

It can be written as a sum of positive squares in only one way, i.e., 41546668900 + 9514441764 = 203830^2 + 97542^2 .

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, 3191319409 + ... + 3191319424.

Almost surely, 2^51061110664 is an apocalyptic number.

It is an amenable number.

51061110664 is a deficient number, since it is larger than the sum of its proper divisors (44678471846).

51061110664 is a wasteful number, since it uses less digits than its factorization.

51061110664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6382638839 (or 6382638835 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 51061110664 its reverse (46601116015), we get a palindrome (97662226679).

The spelling of 51061110664 in words is "fifty-one billion, sixty-one million, one hundred ten thousand, six hundred sixty-four".