266162240161 has 4 divisors (see below), whose sum is σ = 266169846852. Its totient is φ = 266154633472.

The previous prime is 266162240159. The next prime is 266162240191. The reversal of 266162240161 is 161042261662.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4191267600 + 261970972561 = 64740^2 + 511831^2 .

It is a cyclic number.

It is not a de Polignac number, because 266162240161 - 2¹ = 266162240159 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 266162240161.

It is not an unprimeable number, because it can be changed into a prime (266162240111) 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, 3750616 + ... + 3820921.

It is an arithmetic number, because the mean of its divisors is an integer number (66542461713).

Almost surely, 2^266162240161 is an apocalyptic number.

It is an amenable number.

266162240161 is a deficient number, since it is larger than the sum of its proper divisors (7606691).

266162240161 is an equidigital number, since it uses as much as digits as its factorization.

266162240161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7606690.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 266162240161 in words is "two hundred sixty-six billion, one hundred sixty-two million, two hundred forty thousand, one hundred sixty-one".