663727885 has 16 divisors (see below), whose sum is σ = 829290672. Its totient is φ = 509529600.

The previous prime is 663727879. The next prime is 663727907. The reversal of 663727885 is 588727366.

It can be written as a sum of positive squares in 8 ways, for example, as 455993316 + 207734569 = 21354^2 + 14413^2 .

It is not a de Polignac number, because 663727885 - 2³ = 663727877 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 14034 + ... + 39043.

It is an arithmetic number, because the mean of its divisors is an integer number (51830667).

Almost surely, 2^663727885 is an apocalyptic number.

It is an amenable number.

663727885 is a deficient number, since it is larger than the sum of its proper divisors (165562787).

663727885 is a wasteful number, since it uses less digits than its factorization.

663727885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53184.

The product of its digits is 3386880, while the sum is 52.

The square root of 663727885 is about 25762.9168573747. The cubic root of 663727885 is about 872.2949428206.

The spelling of 663727885 in words is "six hundred sixty-three million, seven hundred twenty-seven thousand, eight hundred eighty-five".