666100552 has 32 divisors (see below), whose sum is σ = 1358897400. Its totient is φ = 304257024.

The previous prime is 666100549. The next prime is 666100571. The reversal of 666100552 is 255001666.

It can be written as a sum of positive squares in 4 ways, for example, as 219454596 + 446645956 = 14814^2 + 21134^2 .

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, 22927 + ... + 43102.

Almost surely, 2^666100552 is an apocalyptic number.

It is an amenable number.

666100552 is an abundant number, since it is smaller than the sum of its proper divisors (692796848).

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

666100552 is a wasteful number, since it uses less digits than its factorization.

666100552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66145 (or 66141 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 666100552 is about 25808.9238830293. The cubic root of 666100552 is about 873.3331213539. Note that the first 3 decimals are identical.

The spelling of 666100552 in words is "six hundred sixty-six million, one hundred thousand, five hundred fifty-two".