25491452641 has 2 divisors, whose sum is σ = 25491452642. Its totient is φ = 25491452640.

The previous prime is 25491452629. The next prime is 25491452647. The reversal of 25491452641 is 14625419452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13719202641 + 11772250000 = 117129^2 + 108500^2 .

It is a cyclic number.

It is not a de Polignac number, because 25491452641 - 2⁷ = 25491452513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25491452647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12745726320 + 12745726321.

It is an arithmetic number, because the mean of its divisors is an integer number (12745726321).

Almost surely, 2^25491452641 is an apocalyptic number.

It is an amenable number.

25491452641 is a deficient number, since it is larger than the sum of its proper divisors (1).

25491452641 is an equidigital number, since it uses as much as digits as its factorization.

25491452641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 345600, while the sum is 43.

The spelling of 25491452641 in words is "twenty-five billion, four hundred ninety-one million, four hundred fifty-two thousand, six hundred forty-one".