666859152 has 40 divisors (see below), whose sum is σ = 1724674336. Its totient is φ = 222034176.

The previous prime is 666859139. The next prime is 666859159. The reversal of 666859152 is 251958666.

It is a super-2 number, since 2×666859152² = 889402257212318208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (666859159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37563 + ... + 52389.

Almost surely, 2^666859152 is an apocalyptic number.

It is an amenable number.

666859152 is an abundant number, since it is smaller than the sum of its proper divisors (1057815184).

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

666859152 is a wasteful number, since it uses less digits than its factorization.

666859152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15775 (or 15769 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 666859152 is about 25823.6161681512. The cubic root of 666859152 is about 873.6645323594.

The spelling of 666859152 in words is "six hundred sixty-six million, eight hundred fifty-nine thousand, one hundred fifty-two".