668560494 has 16 divisors (see below), whose sum is σ = 1528138368. Its totient is φ = 191017272.

The previous prime is 668560457. The next prime is 668560507. The reversal of 668560494 is 494065866.

It is a happy number.

It is a congruent number.

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, 7959012 + ... + 7959095.

It is an arithmetic number, because the mean of its divisors is an integer number (95508648).

Almost surely, 2^668560494 is an apocalyptic number.

668560494 is an abundant number, since it is smaller than the sum of its proper divisors (859577874).

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

668560494 is a wasteful number, since it uses less digits than its factorization.

668560494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15918119.

The product of its (nonzero) digits is 1244160, while the sum is 48.

The square root of 668560494 is about 25856.5367750594. The cubic root of 668560494 is about 874.4068879592.

The spelling of 668560494 in words is "six hundred sixty-eight million, five hundred sixty thousand, four hundred ninety-four".