666903120 has 80 divisors (see below), whose sum is σ = 2226440832. Its totient is φ = 164160000.

The previous prime is 666903043. The next prime is 666903197. The reversal of 666903120 is 21309666.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (666903043) and next prime (666903197).

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-3 number, since 3×666903120³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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, 103756 + ... + 109995.

Almost surely, 2^666903120 is an apocalyptic number.

666903120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666903120 is an abundant number, since it is smaller than the sum of its proper divisors (1559537712).

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

666903120 is a wasteful number, since it uses less digits than its factorization.

666903120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213780 (or 213774 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 666903120 is about 25824.4674678879. The cubic root of 666903120 is about 873.6837330346.

The spelling of 666903120 in words is "six hundred sixty-six million, nine hundred three thousand, one hundred twenty".