266664197 has 2 divisors, whose sum is σ = 266664198. Its totient is φ = 266664196.

The previous prime is 266664187. The next prime is 266664241. The reversal of 266664197 is 791466662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228644641 + 38019556 = 15121^2 + 6166^2 .

It is a cyclic number.

It is not a de Polignac number, because 266664197 - 2¹² = 266660101 is a prime.

It is a super-2 number, since 2×266664197² = 142219587923309618, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266664127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133332098 + 133332099.

It is an arithmetic number, because the mean of its divisors is an integer number (133332099).

Almost surely, 2^266664197 is an apocalyptic number.

It is an amenable number.

266664197 is a deficient number, since it is larger than the sum of its proper divisors (1).

266664197 is an equidigital number, since it uses as much as digits as its factorization.

266664197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 266664197 is about 16329.8560005898. The cubic root of 266664197 is about 643.6576027002.

The spelling of 266664197 in words is "two hundred sixty-six million, six hundred sixty-four thousand, one hundred ninety-seven".