666115560 has 96 divisors (see below), whose sum is σ = 2361696480. Its totient is φ = 161481600.

The previous prime is 666115531. The next prime is 666115579. The reversal of 666115560 is 65511666.

It is a super-2 number, since 2×666115560² = 887419878548227200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80146 + ... + 88065.

It is an arithmetic number, because the mean of its divisors is an integer number (24601005).

Almost surely, 2^666115560 is an apocalyptic number.

666115560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666115560 is an abundant number, since it is smaller than the sum of its proper divisors (1695580920).

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

666115560 is a wasteful number, since it uses less digits than its factorization.

666115560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168239 (or 168232 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 666115560 is about 25809.2146335374. The cubic root of 666115560 is about 873.3396803662.

The spelling of 666115560 in words is "six hundred sixty-six million, one hundred fifteen thousand, five hundred sixty".