266161121 has 4 divisors (see below), whose sum is σ = 266348292. Its totient is φ = 265973952.

The previous prime is 266161087. The next prime is 266161127. The reversal of 266161121 is 121161662.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121161662 = 2 ⋅60580831.

It can be written as a sum of positive squares in 2 ways, for example, as 100781521 + 165379600 = 10039^2 + 12860^2 .

It is a cyclic number.

It is not a de Polignac number, because 266161121 - 2⁶ = 266161057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266161127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91436 + ... + 94301.

It is an arithmetic number, because the mean of its divisors is an integer number (66587073).

Almost surely, 2^266161121 is an apocalyptic number.

It is an amenable number.

266161121 is a deficient number, since it is larger than the sum of its proper divisors (187171).

266161121 is a wasteful number, since it uses less digits than its factorization.

266161121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187170.

The product of its digits is 864, while the sum is 26.

The square root of 266161121 is about 16314.4451637192. The cubic root of 266161121 is about 643.2525832827.

The spelling of 266161121 in words is "two hundred sixty-six million, one hundred sixty-one thousand, one hundred twenty-one".