25644474101 has 2 divisors, whose sum is σ = 25644474102. Its totient is φ = 25644474100.

The previous prime is 25644474073. The next prime is 25644474103. The reversal of 25644474101 is 10147444652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20793351601 + 4851122500 = 144199^2 + 69650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25644474101 is a prime.

It is a Sophie Germain prime.

Together with 25644474103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25644474103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12822237050 + 12822237051.

It is an arithmetic number, because the mean of its divisors is an integer number (12822237051).

Almost surely, 2^25644474101 is an apocalyptic number.

It is an amenable number.

25644474101 is a deficient number, since it is larger than the sum of its proper divisors (1).

25644474101 is an equidigital number, since it uses as much as digits as its factorization.

25644474101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 107520, while the sum is 38.

The spelling of 25644474101 in words is "twenty-five billion, six hundred forty-four million, four hundred seventy-four thousand, one hundred one".