51867704664 has 24 divisors (see below), whose sum is σ = 140475033660. Its totient is φ = 17289234864.

The previous prime is 51867704611. The next prime is 51867704717. The reversal of 51867704664 is 46640776815.

51867704664 is a `hidden beast` number, since 51 + 8 + 67 + 70 + 466 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (51867704611) and next prime (51867704717).

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×51867704664² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51867704664.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 360192322 + ... + 360192465.

Almost surely, 2^51867704664 is an apocalyptic number.

It is an amenable number.

51867704664 is an abundant number, since it is smaller than the sum of its proper divisors (88607328996).

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

51867704664 is a wasteful number, since it uses less digits than its factorization.

51867704664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720384799 (or 720384792 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 54.

The spelling of 51867704664 in words is "fifty-one billion, eight hundred sixty-seven million, seven hundred four thousand, six hundred sixty-four".