661333264 has 20 divisors (see below), whose sum is σ = 1315965004. Its totient is φ = 321729408.

The previous prime is 661333241. The next prime is 661333273. The reversal of 661333264 is 462333166.

It can be written as a sum of positive squares in 2 ways, for example, as 573123600 + 88209664 = 23940^2 + 9392^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557967 + ... + 559150.

Almost surely, 2^661333264 is an apocalyptic number.

It is an amenable number.

661333264 is a deficient number, since it is larger than the sum of its proper divisors (654631740).

661333264 is a wasteful number, since it uses less digits than its factorization.

661333264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1117162 (or 1117156 counting only the distinct ones).

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

The square root of 661333264 is about 25716.4006812773. The cubic root of 661333264 is about 871.2446464983.

The spelling of 661333264 in words is "six hundred sixty-one million, three hundred thirty-three thousand, two hundred sixty-four".