666055056 has 80 divisors (see below), whose sum is σ = 1781663744. Its totient is φ = 214244352.

The previous prime is 666055043. The next prime is 666055063. The reversal of 666055056 is 650550666.

It is a happy 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, 224076 + ... + 227028.

Almost surely, 2^666055056 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 666055056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (890831872).

666055056 is an abundant number, since it is smaller than the sum of its proper divisors (1115608688).

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

666055056 is a wasteful number, since it uses less digits than its factorization.

666055056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3128 (or 3122 counting only the distinct ones).

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 666055056 is about 25808.0424674170. The cubic root of 666055056 is about 873.3132374349.

It can be divided in two parts, 6660 and 55056, that added together give a palindrome (61716).

The spelling of 666055056 in words is "six hundred sixty-six million, fifty-five thousand, fifty-six".