666506412 has 72 divisors (see below), whose sum is σ = 1979337360. Its totient is φ = 186433920.

The previous prime is 666506383. The next prime is 666506413. The reversal of 666506412 is 214605666.

It is a happy number.

666506412 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666506412² = 888461594474227488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (666506413) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59587 + ... + 69882.

Almost surely, 2^666506412 is an apocalyptic number.

It is an amenable number.

666506412 is an abundant number, since it is smaller than the sum of its proper divisors (1312830948).

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

666506412 is a wasteful number, since it uses less digits than its factorization.

666506412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129503 (or 129498 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 666506412 is about 25816.7854699225. The cubic root of 666506412 is about 873.5104614537.

The spelling of 666506412 in words is "six hundred sixty-six million, five hundred six thousand, four hundred twelve".