25444459057 has 2 divisors, whose sum is σ = 25444459058. Its totient is φ = 25444459056.

The previous prime is 25444459013. The next prime is 25444459063. The reversal of 25444459057 is 75095444452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13518945441 + 11925513616 = 116271^2 + 109204^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25444459057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25444459057.

It is not a weakly prime, because it can be changed into another prime (25444459087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722229528 + 12722229529.

It is an arithmetic number, because the mean of its divisors is an integer number (12722229529).

Almost surely, 2^25444459057 is an apocalyptic number.

It is an amenable number.

25444459057 is a deficient number, since it is larger than the sum of its proper divisors (1).

25444459057 is an equidigital number, since it uses as much as digits as its factorization.

25444459057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 25444459057 in words is "twenty-five billion, four hundred forty-four million, four hundred fifty-nine thousand, fifty-seven".