666118656 has 240 divisors, whose sum is σ = 2229125184. Its totient is φ = 187564032.

The previous prime is 666118643. The next prime is 666118657. The reversal of 666118656 is 656811666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666118657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3451296 + ... + 3451488.

Almost surely, 2^666118656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666118656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114562592).

666118656 is an abundant number, since it is smaller than the sum of its proper divisors (1563006528).

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

666118656 is a wasteful number, since it uses less digits than its factorization.

666118656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331 (or 312 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 666118656 is about 25809.2746120460. The cubic root of 666118656 is about 873.3410334124.

The spelling of 666118656 in words is "six hundred sixty-six million, one hundred eighteen thousand, six hundred fifty-six".