666656155660 has 48 divisors (see below), whose sum is σ = 1617086812320. Its totient is φ = 228160394240.

The previous prime is 666656155637. The next prime is 666656155687. The reversal of 666656155660 is 66551656666.

666656155660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 666656155595 and 666656155604.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89121415 + ... + 89128894.

It is an arithmetic number, because the mean of its divisors is an integer number (33689308590).

Almost surely, 2^666656155660 is an apocalyptic number.

It is an amenable number.

666656155660 is an abundant number, since it is smaller than the sum of its proper divisors (950430656660).

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

666656155660 is a wasteful number, since it uses less digits than its factorization.

666656155660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178250346 (or 178250344 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 58.

The spelling of 666656155660 in words is "six hundred sixty-six billion, six hundred fifty-six million, one hundred fifty-five thousand, six hundred sixty".