266139768 has 16 divisors (see below), whose sum is σ = 665349480. Its totient is φ = 88713248.

The previous prime is 266139721. The next prime is 266139787. The reversal of 266139768 is 867931662.

It is a super-2 number, since 2×266139768² = 141660752222187648, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5544555 + ... + 5544602.

Almost surely, 2^266139768 is an apocalyptic number.

It is an amenable number.

266139768 is an abundant number, since it is smaller than the sum of its proper divisors (399209712).

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

266139768 is a wasteful number, since it uses less digits than its factorization.

266139768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11089166 (or 11089162 counting only the distinct ones).

The product of its digits is 653184, while the sum is 48.

The square root of 266139768 is about 16313.7907305445. The cubic root of 266139768 is about 643.2353809960.

The spelling of 266139768 in words is "two hundred sixty-six million, one hundred thirty-nine thousand, seven hundred sixty-eight".