666225552 has 40 divisors (see below), whose sum is σ = 1767603136. Its totient is φ = 216072576.

The previous prime is 666225509. The next prime is 666225559. The reversal of 666225552 is 255522666.

It is a super-2 number, since 2×666225552² = 887712972275409408, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666225552.

It is not an unprimeable number, because it can be changed into a prime (666225559) 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, 185788 + ... + 189339.

Almost surely, 2^666225552 is an apocalyptic number.

It is an amenable number.

666225552 is an abundant number, since it is smaller than the sum of its proper divisors (1101377584).

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

666225552 is a wasteful number, since it uses less digits than its factorization.

666225552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375175 (or 375169 counting only the distinct ones).

The product of its digits is 216000, while the sum is 39.

The square root of 666225552 is about 25811.3454124344. The cubic root of 666225552 is about 873.3877476471.

The spelling of 666225552 in words is "six hundred sixty-six million, two hundred twenty-five thousand, five hundred fifty-two".