25145522617 has 2 divisors, whose sum is σ = 25145522618. Its totient is φ = 25145522616.

The previous prime is 25145522531. The next prime is 25145522627. The reversal of 25145522617 is 71622554152.

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., 22249898896 + 2895623721 = 149164^2 + 53811^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25145522617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25145522617.

It is not a weakly prime, because it can be changed into another prime (25145522627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12572761308 + 12572761309.

It is an arithmetic number, because the mean of its divisors is an integer number (12572761309).

Almost surely, 2^25145522617 is an apocalyptic number.

It is an amenable number.

25145522617 is a deficient number, since it is larger than the sum of its proper divisors (1).

25145522617 is an equidigital number, since it uses as much as digits as its factorization.

25145522617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168000, while the sum is 40.

The spelling of 25145522617 in words is "twenty-five billion, one hundred forty-five million, five hundred twenty-two thousand, six hundred seventeen".