666652100 has 36 divisors (see below), whose sum is σ = 1449873348. Its totient is φ = 266064000.

The previous prime is 666652081. The next prime is 666652163. The reversal of 666652100 is 1256666.

It can be written as a sum of positive squares in 6 ways, for example, as 161391616 + 505260484 = 12704^2 + 22478^2 .

It is a nialpdrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38870 + ... + 53330.

Almost surely, 2^666652100 is an apocalyptic number.

It is an amenable number.

666652100 is an abundant number, since it is smaller than the sum of its proper divisors (783221248).

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

666652100 is a wasteful number, since it uses less digits than its factorization.

666652100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14936 (or 14929 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 666652100 is about 25819.6068908882. The cubic root of 666652100 is about 873.5741021122.

The spelling of 666652100 in words is "six hundred sixty-six million, six hundred fifty-two thousand, one hundred".