51615500665 has 8 divisors (see below), whose sum is σ = 61940248128. Its totient is φ = 41291302320.

The previous prime is 51615500659. The next prime is 51615500701. The reversal of 51615500665 is 56600551615.

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

It is a de Polignac number, because none of the positive numbers 2^k-51615500665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 110020 + ... + 339610.

It is an arithmetic number, because the mean of its divisors is an integer number (7742531016).

Almost surely, 2^51615500665 is an apocalyptic number.

It is an amenable number.

51615500665 is a deficient number, since it is larger than the sum of its proper divisors (10324747463).

51615500665 is a wasteful number, since it uses less digits than its factorization.

51615500665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274559.

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 51615500665 in words is "fifty-one billion, six hundred fifteen million, five hundred thousand, six hundred sixty-five".