266663990 has 16 divisors (see below), whose sum is σ = 496547280. Its totient is φ = 102987360.

The previous prime is 266663987. The next prime is 266664017. The reversal of 266663990 is 99366662.

It is a happy number.

It is a super-2 number, since 2×266663990² = 142219367125440200, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459476 + ... + 460055.

It is an arithmetic number, because the mean of its divisors is an integer number (31034205).

Almost surely, 2^266663990 is an apocalyptic number.

266663990 is a deficient number, since it is larger than the sum of its proper divisors (229883290).

266663990 is a wasteful number, since it uses less digits than its factorization.

266663990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919567.

The product of its (nonzero) digits is 629856, while the sum is 47.

The square root of 266663990 is about 16329.8496625046. The cubic root of 266663990 is about 643.6574361522.

The spelling of 266663990 in words is "two hundred sixty-six million, six hundred sixty-three thousand, nine hundred ninety".