25672128169 has 2 divisors, whose sum is σ = 25672128170. Its totient is φ = 25672128168.

The previous prime is 25672128161. The next prime is 25672128233. The reversal of 25672128169 is 96182127652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22616249769 + 3055878400 = 150387^2 + 55280^2 .

It is a cyclic number.

It is not a de Polignac number, because 25672128169 - 2³ = 25672128161 is a prime.

It is a super-2 number, since 2×25672128169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25672128161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12836064084 + 12836064085.

It is an arithmetic number, because the mean of its divisors is an integer number (12836064085).

Almost surely, 2^25672128169 is an apocalyptic number.

It is an amenable number.

25672128169 is a deficient number, since it is larger than the sum of its proper divisors (1).

25672128169 is an equidigital number, since it uses as much as digits as its factorization.

25672128169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 49.

The spelling of 25672128169 in words is "twenty-five billion, six hundred seventy-two million, one hundred twenty-eight thousand, one hundred sixty-nine".