666438912 has 54 divisors (see below), whose sum is σ = 1921514322. Its totient is φ = 222145536.

The previous prime is 666438893. The next prime is 666438979. The reversal of 666438912 is 219834666.

It can be written as a sum of positive squares in only one way, i.e., 580617216 + 85821696 = 24096^2 + 9264^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142323 + ... + 146930.

Almost surely, 2^666438912 is an apocalyptic number.

It is an amenable number.

666438912 is an abundant number, since it is smaller than the sum of its proper divisors (1255075410).

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

666438912 is a wasteful number, since it uses less digits than its factorization.

666438912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289275 (or 289258 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 666438912 is about 25815.4781478089. The cubic root of 666438912 is about 873.4809723917.

The spelling of 666438912 in words is "six hundred sixty-six million, four hundred thirty-eight thousand, nine hundred twelve".