666744012900 has 144 divisors (see below), whose sum is σ = 2449666961280. Its totient is φ = 152398627200.

The previous prime is 666744012889. The next prime is 666744012923. The reversal of 666744012900 is 9210447666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17619831 + ... + 17657630.

It is an arithmetic number, because the mean of its divisors is an integer number (17011576120).

Almost surely, 2^666744012900 is an apocalyptic number.

666744012900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666744012900 is an abundant number, since it is smaller than the sum of its proper divisors (1782922948380).

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

666744012900 is a wasteful number, since it uses less digits than its factorization.

666744012900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35277491 (or 35277478 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 666744012900 in words is "six hundred sixty-six billion, seven hundred forty-four million, twelve thousand, nine hundred".