666706188 has 24 divisors (see below), whose sum is σ = 1577560320. Its totient is φ = 219105040.

The previous prime is 666706177. The next prime is 666706199. The reversal of 666706188 is 881607666.

It is an interprime number because it is at equal distance from previous prime (666706177) and next prime (666706199).

It is a super-2 number, since 2×666706188² = 888994282234982688, which contains 22 as substring.

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, 390408 + ... + 392111.

It is an arithmetic number, because the mean of its divisors is an integer number (65731680).

Almost surely, 2^666706188 is an apocalyptic number.

It is an amenable number.

666706188 is an abundant number, since it is smaller than the sum of its proper divisors (910854132).

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

666706188 is a wasteful number, since it uses less digits than its factorization.

666706188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782597 (or 782595 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 48.

The square root of 666706188 is about 25820.6542907030. The cubic root of 666706188 is about 873.5977269276.

The spelling of 666706188 in words is "six hundred sixty-six million, seven hundred six thousand, one hundred eighty-eight".