666170880 has 160 divisors (see below), whose sum is σ = 2149576704. Its totient is φ = 175988736.

The previous prime is 666170867. The next prime is 666170881. The reversal of 666170880 is 88071666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666170881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 975019 + ... + 975701.

Almost surely, 2^666170880 is an apocalyptic number.

666170880 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 666170880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1074788352).

666170880 is an abundant number, since it is smaller than the sum of its proper divisors (1483405824).

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

666170880 is a wasteful number, since it uses less digits than its factorization.

666170880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 820 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 666170880 is about 25810.2863215424. The cubic root of 666170880 is about 873.3638562583.

The spelling of 666170880 in words is "six hundred sixty-six million, one hundred seventy thousand, eight hundred eighty".