266664321 has 48 divisors (see below), whose sum is σ = 490089600. Its totient is φ = 138509280.

The previous prime is 266664311. The next prime is 266664353. The reversal of 266664321 is 123466662.

It is not a de Polignac number, because 266664321 - 2⁵ = 266664289 is a prime.

It is a super-2 number, since 2×266664321² = 142219720188782082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266664311) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30031 + ... + 37883.

It is an arithmetic number, because the mean of its divisors is an integer number (10210200).

Almost surely, 2^266664321 is an apocalyptic number.

266664321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

266664321 is a deficient number, since it is larger than the sum of its proper divisors (223425279).

266664321 is a wasteful number, since it uses less digits than its factorization.

266664321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7891 (or 7874 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 266664321 is about 16329.8597973161. The cubic root of 266664321 is about 643.6577024680.

The spelling of 266664321 in words is "two hundred sixty-six million, six hundred sixty-four thousand, three hundred twenty-one".