26161616161 has 4 divisors (see below), whose sum is σ = 26552088112. Its totient is φ = 25771144212.

The previous prime is 26161616153. The next prime is 26161616171. The reversal of 26161616161 is 16161616162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26161616161 - 2³ = 26161616153 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 26161616161.

It is not an unprimeable number, because it can be changed into a prime (26161616101) 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, 195235875 + ... + 195236008.

It is an arithmetic number, because the mean of its divisors is an integer number (6638022028).

Almost surely, 2^26161616161 is an apocalyptic number.

It is an amenable number.

26161616161 is a deficient number, since it is larger than the sum of its proper divisors (390471951).

26161616161 is an equidigital number, since it uses as much as digits as its factorization.

26161616161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390471950.

The product of its digits is 15552, while the sum is 37.

Subtracting from 26161616161 its reverse (16161616162), we obtain a palindrome (9999999999).

The spelling of 26161616161 in words is "twenty-six billion, one hundred sixty-one million, six hundred sixteen thousand, one hundred sixty-one".