263331664 has 20 divisors (see below), whose sum is σ = 523995604. Its totient is φ = 128107008.

The previous prime is 263331661. The next prime is 263331667. The reversal of 263331664 is 466133362.

It is an interprime number because it is at equal distance from previous prime (263331661) and next prime (263331667).

It can be written as a sum of positive squares in 2 ways, for example, as 203918400 + 59413264 = 14280^2 + 7708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (263331661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 221817 + ... + 223000.

Almost surely, 2^263331664 is an apocalyptic number.

It is an amenable number.

263331664 is a deficient number, since it is larger than the sum of its proper divisors (260663940).

263331664 is a wasteful number, since it uses less digits than its factorization.

263331664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444862 (or 444856 counting only the distinct ones).

The product of its digits is 46656, while the sum is 34.

The square root of 263331664 is about 16227.4971576026. The cubic root of 263331664 is about 640.9650674635.

The spelling of 263331664 in words is "two hundred sixty-three million, three hundred thirty-one thousand, six hundred sixty-four".