264401565 has 8 divisors (see below), whose sum is σ = 423042528. Its totient is φ = 141014160.

The previous prime is 264401521. The next prime is 264401567. The reversal of 264401565 is 565104462.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-264401565 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264401567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8813371 + ... + 8813400.

It is an arithmetic number, because the mean of its divisors is an integer number (52880316).

Almost surely, 2^264401565 is an apocalyptic number.

It is an amenable number.

264401565 is a deficient number, since it is larger than the sum of its proper divisors (158640963).

264401565 is a wasteful number, since it uses less digits than its factorization.

264401565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17626779.

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 264401565 is about 16260.4294223738. The cubic root of 264401565 is about 641.8319622132.

The spelling of 264401565 in words is "two hundred sixty-four million, four hundred one thousand, five hundred sixty-five".