265520664 has 24 divisors (see below), whose sum is σ = 719118660. Its totient is φ = 88506864.

The previous prime is 265520663. The next prime is 265520677. The reversal of 265520664 is 466025562.

265520664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×265520664² = 141002446022001792, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265520663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1843822 + ... + 1843965.

Almost surely, 2^265520664 is an apocalyptic number.

265520664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

265520664 is an abundant number, since it is smaller than the sum of its proper divisors (453597996).

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

265520664 is a wasteful number, since it uses less digits than its factorization.

265520664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3687799 (or 3687792 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 265520664 is about 16294.8048162597. The cubic root of 265520664 is about 642.7362212349.

The spelling of 265520664 in words is "two hundred sixty-five million, five hundred twenty thousand, six hundred sixty-four".