51506110656660 has 48 divisors (see below), whose sum is σ = 157327756189632. Its totient is φ = 12486329856000.

The previous prime is 51506110656607. The next prime is 51506110656667. The reversal of 51506110656660 is 6665601160515.

It is a super-2 number, since 2×51506110656660² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506110656667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39019780141 + ... + 39019781460.

It is an arithmetic number, because the mean of its divisors is an integer number (3277661587284).

Almost surely, 2^{51506110656660} is an apocalyptic number.

It is an amenable number.

51506110656660 is an abundant number, since it is smaller than the sum of its proper divisors (105821645532972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51506110656660 is a wasteful number, since it uses less digits than its factorization.

51506110656660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78039561624 (or 78039561622 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 51506110656660 in words is "fifty-one trillion, five hundred six billion, one hundred ten million, six hundred fifty-six thousand, six hundred sixty".