261613255679 has 8 divisors (see below), whose sum is σ = 261966368160. Its totient is φ = 261260243200.

The previous prime is 261613255613. The next prime is 261613255691. The reversal of 261613255679 is 976552316162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261613255679 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 261613255679.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261613252679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6255719 + ... + 6297399.

It is an arithmetic number, because the mean of its divisors is an integer number (32745796020).

Almost surely, 2^261613255679 is an apocalyptic number.

261613255679 is a deficient number, since it is larger than the sum of its proper divisors (353112481).

261613255679 is an equidigital number, since it uses as much as digits as its factorization.

261613255679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50001.

The product of its digits is 4082400, while the sum is 53.

The spelling of 261613255679 in words is "two hundred sixty-one billion, six hundred thirteen million, two hundred fifty-five thousand, six hundred seventy-nine".