668244330 has 160 divisors (see below), whose sum is σ = 2049428304. Its totient is φ = 154773504.

The previous prime is 668244329. The next prime is 668244337. The reversal of 668244330 is 33442866.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 271557441 + 396686889 = 16479^2 + 19917^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668244337) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 177144 + ... + 180876.

Almost surely, 2^668244330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668244330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024714152).

668244330 is an abundant number, since it is smaller than the sum of its proper divisors (1381183974).

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

668244330 is a wasteful number, since it uses less digits than its factorization.

668244330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3782 (or 3773 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 668244330 is about 25850.4222402652. The cubic root of 668244330 is about 874.2690297936.

The spelling of 668244330 in words is "six hundred sixty-eight million, two hundred forty-four thousand, three hundred thirty".