66775266 has 20 divisors (see below), whose sum is σ = 149626422. Its totient is φ = 22258368.

The previous prime is 66775223. The next prime is 66775273. The reversal of 66775266 is 66257766.

It can be written as a sum of positive squares in only one way, i.e., 44957025 + 21818241 = 6705^2 + 4671^2 .

It is a super-2 number, since 2×66775266² = 8917872298741512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 205935 + ... + 206258.

Almost surely, 2^66775266 is an apocalyptic number.

66775266 is an abundant number, since it is smaller than the sum of its proper divisors (82851156).

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

66775266 is a wasteful number, since it uses less digits than its factorization.

66775266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412207 (or 412198 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The square root of 66775266 is about 8171.6134269800. The cubic root of 66775266 is about 405.7001879530.

The spelling of 66775266 in words is "sixty-six million, seven hundred seventy-five thousand, two hundred sixty-six".