25254648169 has 2 divisors, whose sum is σ = 25254648170. Its totient is φ = 25254648168.

The previous prime is 25254648151. The next prime is 25254648191. The reversal of 25254648169 is 96184645252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24841542544 + 413105625 = 157612^2 + 20325^2 .

It is a cyclic number.

It is not a de Polignac number, because 25254648169 - 2²¹ = 25252551017 is a prime.

It is a super-2 number, since 2×25254648169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25254648269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12627324084 + 12627324085.

It is an arithmetic number, because the mean of its divisors is an integer number (12627324085).

Almost surely, 2^25254648169 is an apocalyptic number.

It is an amenable number.

25254648169 is a deficient number, since it is larger than the sum of its proper divisors (1).

25254648169 is an equidigital number, since it uses as much as digits as its factorization.

25254648169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4147200, while the sum is 52.

The spelling of 25254648169 in words is "twenty-five billion, two hundred fifty-four million, six hundred forty-eight thousand, one hundred sixty-nine".