265563864 has 48 divisors (see below), whose sum is σ = 720044520. Its totient is φ = 88421760.

The previous prime is 265563839. The next prime is 265563869. The reversal of 265563864 is 468365562.

265563864 is a `hidden beast` number, since 2 + 6 + 5 + 5 + 638 + 6 + 4 = 666.

It is a super-2 number, since 2×265563864² = 141048331725220992, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265563869) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 91524 + ... + 94380.

Almost surely, 2^265563864 is an apocalyptic number.

265563864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

265563864 is an abundant number, since it is smaller than the sum of its proper divisors (454480656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

265563864 is a wasteful number, since it uses less digits than its factorization.

265563864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4160 (or 4153 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The square root of 265563864 is about 16296.1303382122. The cubic root of 265563864 is about 642.7710769013.

The spelling of 265563864 in words is "two hundred sixty-five million, five hundred sixty-three thousand, eight hundred sixty-four".