265335665 has 64 divisors (see below), whose sum is σ = 403783680. Its totient is φ = 163296000.

The previous prime is 265335661. The next prime is 265335667. The reversal of 265335665 is 566533562.

It is not a de Polignac number, because 265335665 - 2² = 265335661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265335661) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1257410 + ... + 1257620.

It is an arithmetic number, because the mean of its divisors is an integer number (6309120).

Almost surely, 2^265335665 is an apocalyptic number.

It is an amenable number.

265335665 is a deficient number, since it is larger than the sum of its proper divisors (138448015).

265335665 is a wasteful number, since it uses less digits than its factorization.

265335665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334.

The product of its digits is 486000, while the sum is 41.

The square root of 265335665 is about 16289.1272019099. The cubic root of 265335665 is about 642.5869131013.

The spelling of 265335665 in words is "two hundred sixty-five million, three hundred thirty-five thousand, six hundred sixty-five".