666623436 has 24 divisors (see below), whose sum is σ = 1637321280. Its totient is φ = 210512592.

The previous prime is 666623423. The next prime is 666623443. The reversal of 666623436 is 634326666.

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

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, 1461666 + ... + 1462121.

It is an arithmetic number, because the mean of its divisors is an integer number (68221720).

Almost surely, 2^666623436 is an apocalyptic number.

It is an amenable number.

666623436 is an abundant number, since it is smaller than the sum of its proper divisors (970697844).

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

666623436 is a wasteful number, since it uses less digits than its factorization.

666623436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2923813 (or 2923811 counting only the distinct ones).

The product of its digits is 559872, while the sum is 42.

The square root of 666623436 is about 25819.0518028839. The cubic root of 666623436 is about 873.5615815952.

The spelling of 666623436 in words is "six hundred sixty-six million, six hundred twenty-three thousand, four hundred thirty-six".