25641414661 has 2 divisors, whose sum is σ = 25641414662. Its totient is φ = 25641414660.

The previous prime is 25641414649. The next prime is 25641414671. The reversal of 25641414661 is 16641414652.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25212676225 + 428738436 = 158785^2 + 20706^2 .

It is a cyclic number.

It is not a de Polignac number, because 25641414661 - 2¹⁷ = 25641283589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25641414671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12820707330 + 12820707331.

It is an arithmetic number, because the mean of its divisors is an integer number (12820707331).

Almost surely, 2^25641414661 is an apocalyptic number.

It is an amenable number.

25641414661 is a deficient number, since it is larger than the sum of its proper divisors (1).

25641414661 is an equidigital number, since it uses as much as digits as its factorization.

25641414661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138240, while the sum is 40.

Subtracting from 25641414661 its reverse (16641414652), we obtain a palindrome (9000000009).

The spelling of 25641414661 in words is "twenty-five billion, six hundred forty-one million, four hundred fourteen thousand, six hundred sixty-one".