51665895635939 has 8 divisors (see below), whose sum is σ = 55919794274400. Its totient is φ = 47451939708096.

The previous prime is 51665895635911. The next prime is 51665895635941. The reversal of 51665895635939 is 93953659856615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51665895635939 - 2²⁸ = 51665627200483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51665895635839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9985674962 + ... + 9985680135.

It is an arithmetic number, because the mean of its divisors is an integer number (6989974284300).

Almost surely, 2^{51665895635939} is an apocalyptic number.

51665895635939 is a deficient number, since it is larger than the sum of its proper divisors (4253898638461).

51665895635939 is a wasteful number, since it uses less digits than its factorization.

51665895635939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19971355309.

The product of its digits is 7085880000, while the sum is 80.

The spelling of 51665895635939 in words is "fifty-one trillion, six hundred sixty-five billion, eight hundred ninety-five million, six hundred thirty-five thousand, nine hundred thirty-nine".