666772271712 has 144 divisors (see below), whose sum is σ = 2031860965680. Its totient is φ = 206663049216.

The previous prime is 666772271587. The next prime is 666772271731. The reversal of 666772271712 is 217172277666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 414037 + ... + 1226772.

It is an arithmetic number, because the mean of its divisors is an integer number (14110145595).

Almost surely, 2^666772271712 is an apocalyptic number.

It is an amenable number.

666772271712 is an abundant number, since it is smaller than the sum of its proper divisors (1365088693968).

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

666772271712 is a wasteful number, since it uses less digits than its factorization.

666772271712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1640925 (or 1640914 counting only the distinct ones).

The product of its digits is 4148928, while the sum is 54.

The spelling of 666772271712 in words is "six hundred sixty-six billion, seven hundred seventy-two million, two hundred seventy-one thousand, seven hundred twelve".