51660706660 has 12 divisors (see below), whose sum is σ = 108487484028. Its totient is φ = 20664282656.

The previous prime is 51660706639. The next prime is 51660706661. The reversal of 51660706660 is 6660706615.

51660706660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 29934536256 + 21726170404 = 173016^2 + 147398^2 .

It is a super-2 number, since 2×51660706660² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51660706661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291517647 + ... + 1291517686.

It is an arithmetic number, because the mean of its divisors is an integer number (9040623669).

Almost surely, 2^51660706660 is an apocalyptic number.

It is an amenable number.

51660706660 is an abundant number, since it is smaller than the sum of its proper divisors (56826777368).

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

51660706660 is a wasteful number, since it uses less digits than its factorization.

51660706660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583035342 (or 2583035340 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 51660706660 in words is "fifty-one billion, six hundred sixty million, seven hundred six thousand, six hundred sixty".