666862080 has 160 divisors (see below), whose sum is σ = 2201430528. Its totient is φ = 172032000.

The previous prime is 666862013. The next prime is 666862127. The reversal of 666862080 is 80268666.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236680 + ... + 239480.

Almost surely, 2^666862080 is an apocalyptic number.

666862080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666862080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1100715264).

666862080 is an abundant number, since it is smaller than the sum of its proper divisors (1534568448).

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

666862080 is a wasteful number, since it uses less digits than its factorization.

666862080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858 (or 2842 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 666862080 is about 25823.6728603814. The cubic root of 666862080 is about 873.6658110332.

The spelling of 666862080 in words is "six hundred sixty-six million, eight hundred sixty-two thousand, eighty".