13161412561 has 16 divisors (see below), whose sum is σ = 14932650240. Its totient is φ = 11494154880.

The previous prime is 13161412553. The next prime is 13161412591. The reversal of 13161412561 is 16521416131.

It is a cyclic number.

It is not a de Polignac number, because 13161412561 - 2³ = 13161412553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13161412591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172516 + ... + 236821.

It is an arithmetic number, because the mean of its divisors is an integer number (933290640).

Almost surely, 2^13161412561 is an apocalyptic number.

13161412561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13161412561 is a deficient number, since it is larger than the sum of its proper divisors (1771237679).

13161412561 is a wasteful number, since it uses less digits than its factorization.

13161412561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409464.

The product of its digits is 4320, while the sum is 31.

Adding to 13161412561 its reverse (16521416131), we get a palindrome (29682828692).

The spelling of 13161412561 in words is "thirteen billion, one hundred sixty-one million, four hundred twelve thousand, five hundred sixty-one".