264560661 has 28 divisors (see below), whose sum is σ = 403448160. Its totient is φ = 173356200.

The previous prime is 264560629. The next prime is 264560663. The reversal of 264560661 is 166065462.

It is a happy number.

264560661 is a `hidden beast` number, since 2 + 6 + 45 + 606 + 6 + 1 = 666.

It is not a de Polignac number, because 264560661 - 2⁵ = 264560629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264560663) by changing a digit.

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 27 ways as a sum of consecutive naturals, for example, 39936 + ... + 46086.

Almost surely, 2^264560661 is an apocalyptic number.

It is an amenable number.

264560661 is a deficient number, since it is larger than the sum of its proper divisors (138887499).

264560661 is an frugal number, since it uses more digits than its factorization.

264560661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6228 (or 6213 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 264560661 is about 16265.3208083948. The cubic root of 264560661 is about 641.9606710120.

The spelling of 264560661 in words is "two hundred sixty-four million, five hundred sixty thousand, six hundred sixty-one".