261437595911 has 4 divisors (see below), whose sum is σ = 275197469400. Its totient is φ = 247677722424.

The previous prime is 261437595893. The next prime is 261437595943. The reversal of 261437595911 is 119595734162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261437595911 - 2¹⁴ = 261437579527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261437591911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6879936716 + ... + 6879936753.

It is an arithmetic number, because the mean of its divisors is an integer number (68799367350).

Almost surely, 2^261437595911 is an apocalyptic number.

261437595911 is a deficient number, since it is larger than the sum of its proper divisors (13759873489).

261437595911 is a wasteful number, since it uses less digits than its factorization.

261437595911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13759873488.

The product of its digits is 2041200, while the sum is 53.

The spelling of 261437595911 in words is "two hundred sixty-one billion, four hundred thirty-seven million, five hundred ninety-five thousand, nine hundred eleven".