261611266664441 has 16 divisors (see below), whose sum is σ = 270408847547520. Its totient is φ = 252959200753920.

The previous prime is 261611266664401. The next prime is 261611266664453. The reversal of 261611266664441 is 144466662116162.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261611266664441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261611266664401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 724056956 + ... + 724418178.

It is an arithmetic number, because the mean of its divisors is an integer number (16900552971720).

Almost surely, 2^{261611266664441} is an apocalyptic number.

It is an amenable number.

261611266664441 is a deficient number, since it is larger than the sum of its proper divisors (8797580883079).

261611266664441 is a wasteful number, since it uses less digits than its factorization.

261611266664441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562576.

The product of its digits is 11943936, while the sum is 56.

The spelling of 261611266664441 in words is "two hundred sixty-one trillion, six hundred eleven billion, two hundred sixty-six million, six hundred sixty-four thousand, four hundred forty-one".