661570264 has 32 divisors (see below), whose sum is σ = 1257767280. Its totient is φ = 326191104.

The previous prime is 661570207. The next prime is 661570271. The reversal of 661570264 is 462075166.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236844 + ... + 239620.

Almost surely, 2^661570264 is an apocalyptic number.

It is an amenable number.

661570264 is a deficient number, since it is larger than the sum of its proper divisors (596197016).

661570264 is a wasteful number, since it uses less digits than its factorization.

661570264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3187 (or 3183 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 661570264 is about 25721.0082228516. The cubic root of 661570264 is about 871.3487091707.

The spelling of 661570264 in words is "six hundred sixty-one million, five hundred seventy thousand, two hundred sixty-four".