265003661 has 12 divisors (see below), whose sum is σ = 289239552. Its totient is φ = 242672976.

The previous prime is 265003643. The next prime is 265003681. The reversal of 265003661 is 166300562.

It is not a de Polignac number, because 265003661 - 2¹⁰ = 265002637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265003601) 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, 15290 + ... + 27636.

It is an arithmetic number, because the mean of its divisors is an integer number (24103296).

Almost surely, 2^265003661 is an apocalyptic number.

It is an amenable number.

265003661 is a deficient number, since it is larger than the sum of its proper divisors (24235891).

265003661 is a wasteful number, since it uses less digits than its factorization.

265003661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12500 (or 12487 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 265003661 is about 16278.9330424325. The cubic root of 265003661 is about 642.3187867272.

The spelling of 265003661 in words is "two hundred sixty-five million, three thousand, six hundred sixty-one".