264715561 has 4 divisors (see below), whose sum is σ = 288780624. Its totient is φ = 240650500.

The previous prime is 264715559. The next prime is 264715573. The reversal of 264715561 is 165517462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 264715561 - 2¹ = 264715559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264715561.

It is not an unprimeable number, because it can be changed into a prime (264715511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12032515 + ... + 12032536.

It is an arithmetic number, because the mean of its divisors is an integer number (72195156).

Almost surely, 2^264715561 is an apocalyptic number.

It is an amenable number.

264715561 is a deficient number, since it is larger than the sum of its proper divisors (24065063).

264715561 is a wasteful number, since it uses less digits than its factorization.

264715561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24065062.

The product of its digits is 50400, while the sum is 37.

The square root of 264715561 is about 16270.0817760698. The cubic root of 264715561 is about 642.0859356761.

The spelling of 264715561 in words is "two hundred sixty-four million, seven hundred fifteen thousand, five hundred sixty-one".