666980160 has 336 divisors, whose sum is σ = 2689433280. Its totient is φ = 138485760.

The previous prime is 666980129. The next prime is 666980179. The reversal of 666980160 is 61089666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 516796 + ... + 518084.

Almost surely, 2^666980160 is an apocalyptic number.

666980160 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 666980160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1344716640).

666980160 is an abundant number, since it is smaller than the sum of its proper divisors (2022453120).

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

666980160 is a wasteful number, since it uses less digits than its factorization.

666980160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 666980160 is about 25825.9590334996. The cubic root of 666980160 is about 873.7173741044.

The spelling of 666980160 in words is "six hundred sixty-six million, nine hundred eighty thousand, one hundred sixty".