264201561 has 32 divisors (see below), whose sum is σ = 435133440. Its totient is φ = 157334400.

The previous prime is 264201559. The next prime is 264201563. The reversal of 264201561 is 165102462.

264201561 is a `hidden beast` number, since 2 + 642 + 0 + 15 + 6 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (264201559) and next prime (264201563).

It is not a de Polignac number, because 264201561 - 2¹ = 264201559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (264201563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1260 + ... + 23021.

It is an arithmetic number, because the mean of its divisors is an integer number (13597920).

Almost surely, 2^264201561 is an apocalyptic number.

It is an amenable number.

264201561 is a deficient number, since it is larger than the sum of its proper divisors (170931879).

264201561 is a wasteful number, since it uses less digits than its factorization.

264201561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24334 (or 24328 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 264201561 is about 16254.2782368212. The cubic root of 264201561 is about 641.6700855349.

Subtracting from 264201561 its reverse (165102462), we obtain a palindrome (99099099).

The spelling of 264201561 in words is "two hundred sixty-four million, two hundred one thousand, five hundred sixty-one".