13865591561 has 8 divisors (see below), whose sum is σ = 15319528704. Its totient is φ = 12482578240.

The previous prime is 13865591533. The next prime is 13865591581. The reversal of 13865591561 is 16519556831.

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 13865591561 - 2³⁰ = 12791849737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13865591521) 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, 17730545 + ... + 17731326.

It is an arithmetic number, because the mean of its divisors is an integer number (1914941088).

Almost surely, 2^13865591561 is an apocalyptic number.

It is an amenable number.

13865591561 is a deficient number, since it is larger than the sum of its proper divisors (1453937143).

13865591561 is a wasteful number, since it uses less digits than its factorization.

13865591561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35461911.

The product of its digits is 972000, while the sum is 50.

The spelling of 13865591561 in words is "thirteen billion, eight hundred sixty-five million, five hundred ninety-one thousand, five hundred sixty-one".