668844410 has 16 divisors (see below), whose sum is σ = 1296529416. Its totient is φ = 246957888.

The previous prime is 668844389. The next prime is 668844457. The reversal of 668844410 is 14448866.

It can be written as a sum of positive squares in 4 ways, for example, as 606292129 + 62552281 = 24623^2 + 7909^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2572349 + ... + 2572608.

Almost surely, 2^668844410 is an apocalyptic number.

668844410 is a deficient number, since it is larger than the sum of its proper divisors (627685006).

668844410 is a wasteful number, since it uses less digits than its factorization.

668844410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5144977.

The product of its (nonzero) digits is 147456, while the sum is 41.

The square root of 668844410 is about 25862.0264093903. The cubic root of 668844410 is about 874.5306478752.

The spelling of 668844410 in words is "six hundred sixty-eight million, eight hundred forty-four thousand, four hundred ten".