666275772 has 12 divisors (see below), whose sum is σ = 1554643496. Its totient is φ = 222091920.

The previous prime is 666275759. The next prime is 666275837. The reversal of 666275772 is 277572666.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27761479 + ... + 27761502.

Almost surely, 2^666275772 is an apocalyptic number.

It is an amenable number.

666275772 is an abundant number, since it is smaller than the sum of its proper divisors (888367724).

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

666275772 is a wasteful number, since it uses less digits than its factorization.

666275772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55522988 (or 55522986 counting only the distinct ones).

The product of its digits is 1481760, while the sum is 48.

The square root of 666275772 is about 25812.3182221202. The cubic root of 666275772 is about 873.4096923827.

The spelling of 666275772 in words is "six hundred sixty-six million, two hundred seventy-five thousand, seven hundred seventy-two".