51646664615 has 64 divisors (see below), whose sum is σ = 81565989120. Its totient is φ = 30462566400.

The previous prime is 51646664603. The next prime is 51646664653.

51646664615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51646664615 - 2⁶ = 51646664551 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 748181 + ... + 814289.

It is an arithmetic number, because the mean of its divisors is an integer number (1274468580).

Almost surely, 2^51646664615 is an apocalyptic number.

51646664615 is a deficient number, since it is larger than the sum of its proper divisors (29919324505).

51646664615 is a wasteful number, since it uses less digits than its factorization.

51646664615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66252.

The product of its digits is 3110400, while the sum is 50.

The spelling of 51646664615 in words is "fifty-one billion, six hundred forty-six million, six hundred sixty-four thousand, six hundred fifteen".