265961555 has 12 divisors (see below), whose sum is σ = 329787216. Its totient is φ = 205902000.

The previous prime is 265961543. The next prime is 265961561. The reversal of 265961555 is 555169562.

265961555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 265961555 - 2⁴ = 265961539 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22871 + ... + 32480.

It is an arithmetic number, because the mean of its divisors is an integer number (27482268).

Almost surely, 2^265961555 is an apocalyptic number.

265961555 is a deficient number, since it is larger than the sum of its proper divisors (63825661).

265961555 is an equidigital number, since it uses as much as digits as its factorization.

265961555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55418 (or 55387 counting only the distinct ones).

The product of its digits is 405000, while the sum is 44.

The square root of 265961555 is about 16308.3277806156. The cubic root of 265961555 is about 643.0917741182.

The spelling of 265961555 in words is "two hundred sixty-five million, nine hundred sixty-one thousand, five hundred fifty-five".