261441363006565 has 16 divisors (see below), whose sum is σ = 358558783712640. Its totient is φ = 179268763124160.

The previous prime is 261441363006529. The next prime is 261441363006589. The reversal of 261441363006565 is 565600363144162.

It is not a de Polignac number, because 261441363006565 - 2⁹ = 261441363006053 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 109518226 + ... + 111879955.

It is an arithmetic number, because the mean of its divisors is an integer number (22409923982040).

Almost surely, 2^{261441363006565} is an apocalyptic number.

It is an amenable number.

261441363006565 is a deficient number, since it is larger than the sum of its proper divisors (97117420706075).

261441363006565 is a wasteful number, since it uses less digits than its factorization.

261441363006565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221431932.

The product of its (nonzero) digits is 9331200, while the sum is 52.

The spelling of 261441363006565 in words is "two hundred sixty-one trillion, four hundred forty-one billion, three hundred sixty-three million, six thousand, five hundred sixty-five".