663445266 has 32 divisors (see below), whose sum is σ = 1448471808. Its totient is φ = 200911440.

The previous prime is 663445259. The next prime is 663445319. The reversal of 663445266 is 662544366.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152761 + ... + 157043.

It is an arithmetic number, because the mean of its divisors is an integer number (45264744).

Almost surely, 2^663445266 is an apocalyptic number.

663445266 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

663445266 is an abundant number, since it is smaller than the sum of its proper divisors (785026542).

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

663445266 is a wasteful number, since it uses less digits than its factorization.

663445266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6646.

The product of its digits is 622080, while the sum is 42.

The square root of 663445266 is about 25757.4312772062. The cubic root of 663445266 is about 872.1711159085.

The spelling of 663445266 in words is "six hundred sixty-three million, four hundred forty-five thousand, two hundred sixty-six".