25466531261 has 2 divisors, whose sum is σ = 25466531262. Its totient is φ = 25466531260.

The previous prime is 25466531249. The next prime is 25466531303. The reversal of 25466531261 is 16213566452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22893505636 + 2573025625 = 151306^2 + 50725^2 .

It is a cyclic number.

It is not a de Polignac number, because 25466531261 - 2⁶ = 25466531197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25466530261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12733265630 + 12733265631.

It is an arithmetic number, because the mean of its divisors is an integer number (12733265631).

Almost surely, 2^25466531261 is an apocalyptic number.

It is an amenable number.

25466531261 is a deficient number, since it is larger than the sum of its proper divisors (1).

25466531261 is an equidigital number, since it uses as much as digits as its factorization.

25466531261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 41.

The spelling of 25466531261 in words is "twenty-five billion, four hundred sixty-six million, five hundred thirty-one thousand, two hundred sixty-one".