51651566086 has 4 divisors (see below), whose sum is σ = 77477349132. Its totient is φ = 25825783042.

The previous prime is 51651566059. The next prime is 51651566093. The reversal of 51651566086 is 68066515615.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12912891520 + ... + 12912891523.

It is an arithmetic number, because the mean of its divisors is an integer number (19369337283).

Almost surely, 2^51651566086 is an apocalyptic number.

51651566086 is a deficient number, since it is larger than the sum of its proper divisors (25825783046).

51651566086 is a wasteful number, since it uses less digits than its factorization.

51651566086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25825783045.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 51651566086 in words is "fifty-one billion, six hundred fifty-one million, five hundred sixty-six thousand, eighty-six".