26129692161 has 24 divisors (see below), whose sum is σ = 37985485824. Its totient is φ = 17308045440.

The previous prime is 26129692153. The next prime is 26129692177. The reversal of 26129692161 is 16129692162.

26129692161 is a `hidden beast` number, since 2 + 612 + 9 + 6 + 9 + 21 + 6 + 1 = 666.

It is not a de Polignac number, because 26129692161 - 2³ = 26129692153 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26129692261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1516185 + ... + 1533321.

It is an arithmetic number, because the mean of its divisors is an integer number (1582728576).

Almost surely, 2^26129692161 is an apocalyptic number.

It is an amenable number.

26129692161 is a deficient number, since it is larger than the sum of its proper divisors (11855793663).

26129692161 is a wasteful number, since it uses less digits than its factorization.

26129692161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18221 (or 18218 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

Subtracting from 26129692161 its reverse (16129692162), we obtain a palindrome (9999999999).

The spelling of 26129692161 in words is "twenty-six billion, one hundred twenty-nine million, six hundred ninety-two thousand, one hundred sixty-one".