266321806 has 16 divisors (see below), whose sum is σ = 413591040. Its totient is φ = 128483640.

The previous prime is 266321801. The next prime is 266321827. The reversal of 266321806 is 608123662.

It is a happy number.

It is a super-2 number, since 2×266321806² = 141854608702203272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266321801) 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, 15325 + ... + 27703.

It is an arithmetic number, because the mean of its divisors is an integer number (25849440).

Almost surely, 2^266321806 is an apocalyptic number.

266321806 is a deficient number, since it is larger than the sum of its proper divisors (147269234).

266321806 is a wasteful number, since it uses less digits than its factorization.

266321806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12759.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 266321806 is about 16319.3690441757. The cubic root of 266321806 is about 643.3820039481.

The spelling of 266321806 in words is "two hundred sixty-six million, three hundred twenty-one thousand, eight hundred six".