266661097 has 2 divisors, whose sum is σ = 266661098. Its totient is φ = 266661096.

The previous prime is 266661077. The next prime is 266661113. The reversal of 266661097 is 790166662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239506576 + 27154521 = 15476^2 + 5211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266661097 is a prime.

It is a super-2 number, since 2×266661097² = 142216281306486818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266661077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133330548 + 133330549.

It is an arithmetic number, because the mean of its divisors is an integer number (133330549).

Almost surely, 2^266661097 is an apocalyptic number.

It is an amenable number.

266661097 is a deficient number, since it is larger than the sum of its proper divisors (1).

266661097 is an equidigital number, since it uses as much as digits as its factorization.

266661097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 266661097 is about 16329.7610821469. The cubic root of 266661097 is about 643.6551084942.

The spelling of 266661097 in words is "two hundred sixty-six million, six hundred sixty-one thousand, ninety-seven".