261544465413611 has 32 divisors (see below), whose sum is σ = 277914375297216. Its totient is φ = 245788577280000.

The previous prime is 261544465413601. The next prime is 261544465413629. The reversal of 261544465413611 is 116314564445162.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 261544465413611 - 2⁶ = 261544465413547 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261544465413601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1831331396 + ... + 1831474206.

It is an arithmetic number, because the mean of its divisors is an integer number (8684824228038).

Almost surely, 2^{261544465413611} is an apocalyptic number.

261544465413611 is a deficient number, since it is larger than the sum of its proper divisors (16369909883605).

261544465413611 is a wasteful number, since it uses less digits than its factorization.

261544465413611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154943.

The product of its digits is 8294400, while the sum is 53.

The spelling of 261544465413611 in words is "two hundred sixty-one trillion, five hundred forty-four billion, four hundred sixty-five million, four hundred thirteen thousand, six hundred eleven".