1668804426 has 24 divisors (see below), whose sum is σ = 3624347844. Its totient is φ = 554944320.

The previous prime is 1668804413. The next prime is 1668804457. The reversal of 1668804426 is 6244088661.

It can be written as a sum of positive squares in 2 ways, for example, as 1668804201 + 225 = 40851^2 + 15^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102531 + ... + 117686.

Almost surely, 2^1668804426 is an apocalyptic number.

1668804426 is an abundant number, since it is smaller than the sum of its proper divisors (1955543418).

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

1668804426 is a wasteful number, since it uses less digits than its factorization.

1668804426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220646 (or 220643 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 1668804426 is about 40851.0027539105. The cubic root of 1668804426 is about 1186.1378037075.

The spelling of 1668804426 in words is "one billion, six hundred sixty-eight million, eight hundred four thousand, four hundred twenty-six".