668156256 has 96 divisors (see below), whose sum is σ = 2033579520. Its totient is φ = 213028992.

The previous prime is 668156243. The next prime is 668156263. The reversal of 668156256 is 652651866.

It is a happy number.

668156256 is a `hidden beast` number, since 6 + 6 + 8 + 15 + 625 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3061 + ... + 36683.

It is an arithmetic number, because the mean of its divisors is an integer number (21183120).

Almost surely, 2^668156256 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 668156256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1016789760).

668156256 is an abundant number, since it is smaller than the sum of its proper divisors (1365423264).

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

668156256 is a wasteful number, since it uses less digits than its factorization.

668156256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33665 (or 33651 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 668156256 is about 25848.7186529623. The cubic root of 668156256 is about 874.2306188162.

The spelling of 668156256 in words is "six hundred sixty-eight million, one hundred fifty-six thousand, two hundred fifty-six".