265491616 has 24 divisors (see below), whose sum is σ = 562894164. Its totient is φ = 122534400.

The previous prime is 265491593. The next prime is 265491623. The reversal of 265491616 is 616194562.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 256128016 + 9363600 = 16004^2 + 3060^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 318685 + ... + 319516.

Almost surely, 2^265491616 is an apocalyptic number.

265491616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

265491616 is an abundant number, since it is smaller than the sum of its proper divisors (297402548).

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

265491616 is a wasteful number, since it uses less digits than its factorization.

265491616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 638224 (or 638216 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 265491616 is about 16293.9134648494. The cubic root of 265491616 is about 642.7127819008.

The spelling of 265491616 in words is "two hundred sixty-five million, four hundred ninety-one thousand, six hundred sixteen".