25466531249 has 2 divisors, whose sum is σ = 25466531250. Its totient is φ = 25466531248.

The previous prime is 25466531243. The next prime is 25466531261. The reversal of 25466531249 is 94213566452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21425640625 + 4040890624 = 146375^2 + 63568^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25466531249 is a prime.

It is not a weakly prime, because it can be changed into another prime (25466531243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12733265624 + 12733265625.

It is an arithmetic number, because the mean of its divisors is an integer number (12733265625).

Almost surely, 2^25466531249 is an apocalyptic number.

It is an amenable number.

25466531249 is a deficient number, since it is larger than the sum of its proper divisors (1).

25466531249 is an equidigital number, since it uses as much as digits as its factorization.

25466531249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555200, while the sum is 47.

The spelling of 25466531249 in words is "twenty-five billion, four hundred sixty-six million, five hundred thirty-one thousand, two hundred forty-nine".