666356120 has 16 divisors (see below), whose sum is σ = 1499301360. Its totient is φ = 266542432.

The previous prime is 666356111. The next prime is 666356137. The reversal of 666356120 is 21653666.

It is a super-2 number, since 2×666356120² = 888060957322908800, which contains 22 as substring.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 8329412 + ... + 8329491.

It is an arithmetic number, because the mean of its divisors is an integer number (93706335).

Almost surely, 2^666356120 is an apocalyptic number.

It is an amenable number.

666356120 is an abundant number, since it is smaller than the sum of its proper divisors (832945240).

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

666356120 is a wasteful number, since it uses less digits than its factorization.

666356120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16658914 (or 16658910 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 666356120 is about 25813.8745638852. The cubic root of 666356120 is about 873.4447999183. Note that the first 3 decimals are identical.

The spelling of 666356120 in words is "six hundred sixty-six million, three hundred fifty-six thousand, one hundred twenty".