668133522 has 120 divisors (see below), whose sum is σ = 1766928636. Its totient is φ = 188116992.

The previous prime is 668133517. The next prime is 668133533. The reversal of 668133522 is 225331866.

It is a happy number.

668133522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 644601321 + 23532201 = 25389^2 + 4851^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 578898 + ... + 580050.

Almost surely, 2^668133522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668133522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (883464318).

668133522 is an abundant number, since it is smaller than the sum of its proper divisors (1098795114).

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

668133522 is a wasteful number, since it uses less digits than its factorization.

668133522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1238 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 668133522 is about 25848.2788982168. The cubic root of 668133522 is about 874.2207034787.

The spelling of 668133522 in words is "six hundred sixty-eight million, one hundred thirty-three thousand, five hundred twenty-two".