265921866 has 40 divisors (see below), whose sum is σ = 680988000. Its totient is φ = 75977352.

The previous prime is 265921841. The next prime is 265921867. The reversal of 265921866 is 668129562.

It is not an unprimeable number, because it can be changed into a prime (265921867) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 116116 + ... + 118383.

It is an arithmetic number, because the mean of its divisors is an integer number (17024700).

Almost surely, 2^265921866 is an apocalyptic number.

265921866 is an abundant number, since it is smaller than the sum of its proper divisors (415066134).

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

265921866 is a wasteful number, since it uses less digits than its factorization.

265921866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234520 (or 234511 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 265921866 is about 16307.1109029159. The cubic root of 265921866 is about 643.0597833553.

The spelling of 265921866 in words is "two hundred sixty-five million, nine hundred twenty-one thousand, eight hundred sixty-six".