666207554772 has 24 divisors (see below), whose sum is σ = 1555749165600. Its totient is φ = 221888489056.

The previous prime is 666207554653. The next prime is 666207554797. The reversal of 666207554772 is 277455702666.

It is a happy number.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22571622 + ... + 22601117.

It is an arithmetic number, because the mean of its divisors is an integer number (64822881900).

Almost surely, 2^666207554772 is an apocalyptic number.

It is an amenable number.

666207554772 is an abundant number, since it is smaller than the sum of its proper divisors (889541610828).

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

666207554772 is a wasteful number, since it uses less digits than its factorization.

666207554772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45173975 (or 45173973 counting only the distinct ones).

The product of its (nonzero) digits is 29635200, while the sum is 57.

The spelling of 666207554772 in words is "six hundred sixty-six billion, two hundred seven million, five hundred fifty-four thousand, seven hundred seventy-two".