25506054169 has 2 divisors, whose sum is σ = 25506054170. Its totient is φ = 25506054168.

The previous prime is 25506054139. The next prime is 25506054247. The reversal of 25506054169 is 96145060552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14816975625 + 10689078544 = 121725^2 + 103388^2 .

It is a cyclic number.

It is not a de Polignac number, because 25506054169 - 2¹³ = 25506045977 is a prime.

It is a super-2 number, since 2×25506054169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25506054139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12753027084 + 12753027085.

It is an arithmetic number, because the mean of its divisors is an integer number (12753027085).

Almost surely, 2^25506054169 is an apocalyptic number.

It is an amenable number.

25506054169 is a deficient number, since it is larger than the sum of its proper divisors (1).

25506054169 is an equidigital number, since it uses as much as digits as its factorization.

25506054169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 25506054169 in words is "twenty-five billion, five hundred six million, fifty-four thousand, one hundred sixty-nine".