666551550156 has 24 divisors (see below), whose sum is σ = 1555305729600. Its totient is φ = 222181167312.

The previous prime is 666551550149. The next prime is 666551550191. The reversal of 666551550156 is 651055155666.

It is a junction number, because it is equal to n+sod(n) for n = 666551550099 and 666551550108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874495 + ... + 1448393.

It is an arithmetic number, because the mean of its divisors is an integer number (64804405400).

Almost surely, 2^666551550156 is an apocalyptic number.

It is an amenable number.

666551550156 is an abundant number, since it is smaller than the sum of its proper divisors (888754179444).

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

666551550156 is a wasteful number, since it uses less digits than its factorization.

666551550156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670693 (or 670691 counting only the distinct ones).

The product of its (nonzero) digits is 4050000, while the sum is 51.

The spelling of 666551550156 in words is "six hundred sixty-six billion, five hundred fifty-one million, five hundred fifty thousand, one hundred fifty-six".