666221054712 has 64 divisors (see below), whose sum is σ = 1698161757600. Its totient is φ = 217767813120.

The previous prime is 666221054689. The next prime is 666221054713. The reversal of 666221054712 is 217450122666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666221054713) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1058989 + ... + 1566492.

Almost surely, 2^666221054712 is an apocalyptic number.

It is an amenable number.

666221054712 is an abundant number, since it is smaller than the sum of its proper divisors (1031940702888).

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

666221054712 is a wasteful number, since it uses less digits than its factorization.

666221054712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625696 (or 2625692 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 666221054712 in words is "six hundred sixty-six billion, two hundred twenty-one million, fifty-four thousand, seven hundred twelve".