666623260900 has 27 divisors (see below), whose sum is σ = 1446590193769. Its totient is φ = 266646038480.

The previous prime is 666623260861. The next prime is 666623260969. The reversal of 666623260900 is 9062326666.

The square root of 666623260900 is 816470.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 239984373924 + 426638886976 = 489882^2 + 653176^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 8123877 + ... + 8205523.

Almost surely, 2^666623260900 is an apocalyptic number.

666623260900 is the 816470-th square number.

It is an amenable number.

666623260900 is an abundant number, since it is smaller than the sum of its proper divisors (779966932869).

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

666623260900 is an frugal number, since it uses more digits than its factorization.

666623260900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163308 (or 81654 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 46.

The spelling of 666623260900 in words is "six hundred sixty-six billion, six hundred twenty-three million, two hundred sixty thousand, nine hundred".