265665001 has 16 divisors (see below), whose sum is σ = 323809920. Its totient is φ = 212762880.

The previous prime is 265664981. The next prime is 265665007. The reversal of 265665001 is 100566562.

It is a cyclic number.

It is not a de Polignac number, because 265665001 - 2⁷ = 265664873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (265665007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8511 + ... + 24571.

It is an arithmetic number, because the mean of its divisors is an integer number (20238120).

Almost surely, 2^265665001 is an apocalyptic number.

It is an amenable number.

265665001 is a deficient number, since it is larger than the sum of its proper divisors (58144919).

265665001 is a wasteful number, since it uses less digits than its factorization.

265665001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16224.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 265665001 is about 16299.2331414702. The cubic root of 265665001 is about 642.8526639147.

The spelling of 265665001 in words is "two hundred sixty-five million, six hundred sixty-five thousand, one".