25920822017 has 2 divisors, whose sum is σ = 25920822018. Its totient is φ = 25920822016.

The previous prime is 25920821987. The next prime is 25920822043. The reversal of 25920822017 is 71022802952.

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., 25562893456 + 357928561 = 159884^2 + 18919^2 .

It is a cyclic number.

It is not a de Polignac number, because 25920822017 - 2⁸ = 25920821761 is a prime.

It is not a weakly prime, because it can be changed into another prime (25920822817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12960411008 + 12960411009.

It is an arithmetic number, because the mean of its divisors is an integer number (12960411009).

Almost surely, 2^25920822017 is an apocalyptic number.

It is an amenable number.

25920822017 is a deficient number, since it is larger than the sum of its proper divisors (1).

25920822017 is an equidigital number, since it uses as much as digits as its factorization.

25920822017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 38.

The spelling of 25920822017 in words is "twenty-five billion, nine hundred twenty million, eight hundred twenty-two thousand, seventeen".