266158961 has 2 divisors, whose sum is σ = 266158962. Its totient is φ = 266158960.

The previous prime is 266158931. The next prime is 266158993. The reversal of 266158961 is 169851662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 183439936 + 82719025 = 13544^2 + 9095^2 .

It is a cyclic number.

It is not a de Polignac number, because 266158961 - 2¹⁸ = 265896817 is a prime.

It is not a weakly prime, because it can be changed into another prime (266158931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133079480 + 133079481.

It is an arithmetic number, because the mean of its divisors is an integer number (133079481).

Almost surely, 2^266158961 is an apocalyptic number.

It is an amenable number.

266158961 is a deficient number, since it is larger than the sum of its proper divisors (1).

266158961 is an equidigital number, since it uses as much as digits as its factorization.

266158961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 44.

The square root of 266158961 is about 16314.3789645821. The cubic root of 266158961 is about 643.2508431972.

The spelling of 266158961 in words is "two hundred sixty-six million, one hundred fifty-eight thousand, nine hundred sixty-one".