266402666 has 16 divisors (see below), whose sum is σ = 410303880. Its totient is φ = 129649920.

The previous prime is 266402663. The next prime is 266402681. The reversal of 266402666 is 666204662.

It can be written as a sum of positive squares in 4 ways, for example, as 163968025 + 102434641 = 12805^2 + 10121^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (266402663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33920 + ... + 41028.

Almost surely, 2^266402666 is an apocalyptic number.

266402666 is a deficient number, since it is larger than the sum of its proper divisors (143901214).

266402666 is a wasteful number, since it uses less digits than its factorization.

266402666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 266402666 is about 16321.8462803691. The cubic root of 266402666 is about 643.4471114026.

The spelling of 266402666 in words is "two hundred sixty-six million, four hundred two thousand, six hundred sixty-six".