666680880 has 40 divisors (see below), whose sum is σ = 2066711472. Its totient is φ = 177781504.

The previous prime is 666680879. The next prime is 666680953. The reversal of 666680880 is 88086666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 1388679 + ... + 1389158.

Almost surely, 2^666680880 is an apocalyptic number.

666680880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666680880 is an abundant number, since it is smaller than the sum of its proper divisors (1400030592).

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

666680880 is a wasteful number, since it uses less digits than its factorization.

666680880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777853 (or 2777847 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 48.

The square root of 666680880 is about 25820.1642132656. The cubic root of 666680880 is about 873.5866729373.

The spelling of 666680880 in words is "six hundred sixty-six million, six hundred eighty thousand, eight hundred eighty".