51651515060661 has 64 divisors (see below), whose sum is σ = 74545277184000. Its totient is φ = 31690553696256.

The previous prime is 51651515060657. The next prime is 51651515060687. The reversal of 51651515060661 is 16606051515615.

It is not a de Polignac number, because 51651515060661 - 2² = 51651515060657 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51651515060661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51651515068661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2081954425 + ... + 2081979233.

It is an arithmetic number, because the mean of its divisors is an integer number (1164769956000).

Almost surely, 2^{51651515060661} is an apocalyptic number.

51651515060661 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

51651515060661 is a deficient number, since it is larger than the sum of its proper divisors (22893762123339).

51651515060661 is a wasteful number, since it uses less digits than its factorization.

51651515060661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27438.

The product of its (nonzero) digits is 810000, while the sum is 48.

The spelling of 51651515060661 in words is "fifty-one trillion, six hundred fifty-one billion, five hundred fifteen million, sixty thousand, six hundred sixty-one".