266665764 has 48 divisors (see below), whose sum is σ = 636446720. Its totient is φ = 86879520.

The previous prime is 266665727. The next prime is 266665783. The reversal of 266665764 is 467566662.

It is a super-2 number, since 2×266665764² = 142221259379407392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96279 + ... + 99009.

Almost surely, 2^266665764 is an apocalyptic number.

It is an amenable number.

266665764 is an abundant number, since it is smaller than the sum of its proper divisors (369780956).

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

266665764 is a wasteful number, since it uses less digits than its factorization.

266665764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2920 (or 2918 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 48.

The square root of 266665764 is about 16329.9039801219. The cubic root of 266665764 is about 643.6588634737.

The spelling of 266665764 in words is "two hundred sixty-six million, six hundred sixty-five thousand, seven hundred sixty-four".