666772680 has 64 divisors (see below), whose sum is σ = 2286080640. Its totient is φ = 152404992.

The previous prime is 666772651. The next prime is 666772697. The reversal of 666772680 is 86277666.

It is a happy number.

666772680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 396049 + ... + 397728.

It is an arithmetic number, because the mean of its divisors is an integer number (35720010).

Almost surely, 2^666772680 is an apocalyptic number.

666772680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666772680 is an abundant number, since it is smaller than the sum of its proper divisors (1619307960).

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

666772680 is a wasteful number, since it uses less digits than its factorization.

666772680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793798 (or 793794 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 48.

The square root of 666772680 is about 25821.9418324804. The cubic root of 666772680 is about 873.6267678705.

The spelling of 666772680 in words is "six hundred sixty-six million, seven hundred seventy-two thousand, six hundred eighty".