261541595159 has 8 divisors (see below), whose sum is σ = 281672319600. Its totient is φ = 241412605056.

The previous prime is 261541595149. The next prime is 261541595171. The reversal of 261541595159 is 951595145162.

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

It is a cyclic number.

It is not a de Polignac number, because 261541595159 - 2⁴ = 261541595143 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 261541595159.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261541595129) 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, 111509 + ... + 731790.

It is an arithmetic number, because the mean of its divisors is an integer number (35209039950).

Almost surely, 2^261541595159 is an apocalyptic number.

261541595159 is a deficient number, since it is larger than the sum of its proper divisors (20130724441).

261541595159 is a wasteful number, since it uses less digits than its factorization.

261541595159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867169.

The product of its digits is 2430000, while the sum is 53.

The spelling of 261541595159 in words is "two hundred sixty-one billion, five hundred forty-one million, five hundred ninety-five thousand, one hundred fifty-nine".