51651660015 has 20 divisors (see below), whose sum is σ = 92590383864. Its totient is φ = 27547551792.

The previous prime is 51651660001. The next prime is 51651660023. The reversal of 51651660015 is 51006615615.

It is not a de Polignac number, because 51651660015 - 2¹³ = 51651651823 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 (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 63767077 + ... + 63767886.

Almost surely, 2^51651660015 is an apocalyptic number.

51651660015 is a deficient number, since it is larger than the sum of its proper divisors (40938723849).

51651660015 is a wasteful number, since it uses less digits than its factorization.

51651660015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127534980 (or 127534971 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51651660015 in words is "fifty-one billion, six hundred fifty-one million, six hundred sixty thousand, fifteen".