266774197 has 2 divisors, whose sum is σ = 266774198. Its totient is φ = 266774196.

The previous prime is 266774177. The next prime is 266774293. The reversal of 266774197 is 791477662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160807761 + 105966436 = 12681^2 + 10294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266774197 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 266774197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266774147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133387098 + 133387099.

It is an arithmetic number, because the mean of its divisors is an integer number (133387099).

Almost surely, 2^266774197 is an apocalyptic number.

It is an amenable number.

266774197 is a deficient number, since it is larger than the sum of its proper divisors (1).

266774197 is an equidigital number, since it uses as much as digits as its factorization.

266774197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 889056, while the sum is 49.

The square root of 266774197 is about 16333.2237173192. The cubic root of 266774197 is about 643.7460942736.

The spelling of 266774197 in words is "two hundred sixty-six million, seven hundred seventy-four thousand, one hundred ninety-seven".