666644412 has 72 divisors (see below), whose sum is σ = 1904730240. Its totient is φ = 180442080.

The previous prime is 666644411. The next prime is 666644413. The reversal of 666644412 is 214446666.

It is an interprime number because it is at equal distance from previous prime (666644411) and next prime (666644413).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666644411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18664 + ... + 41007.

Almost surely, 2^666644412 is an apocalyptic number.

It is an amenable number.

666644412 is an abundant number, since it is smaller than the sum of its proper divisors (1238085828).

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

666644412 is a wasteful number, since it uses less digits than its factorization.

666644412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59711 (or 59702 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The square root of 666644412 is about 25819.4580113526. The cubic root of 666644412 is about 873.5707440071.

The spelling of 666644412 in words is "six hundred sixty-six million, six hundred forty-four thousand, four hundred twelve".