266161591 has 2 divisors, whose sum is σ = 266161592. Its totient is φ = 266161590.

The previous prime is 266161583. The next prime is 266161631. The reversal of 266161591 is 195161662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266161591 - 2³ = 266161583 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 266161591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266161561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133080795 + 133080796.

It is an arithmetic number, because the mean of its divisors is an integer number (133080796).

Almost surely, 2^266161591 is an apocalyptic number.

266161591 is a deficient number, since it is larger than the sum of its proper divisors (1).

266161591 is an equidigital number, since it uses as much as digits as its factorization.

266161591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 37.

The square root of 266161591 is about 16314.4595681254. The cubic root of 266161591 is about 643.2529619112.

The spelling of 266161591 in words is "two hundred sixty-six million, one hundred sixty-one thousand, five hundred ninety-one".