25206501505217 has 2 divisors, whose sum is σ = 25206501505218. Its totient is φ = 25206501505216.

The previous prime is 25206501505121. The next prime is 25206501505249. The reversal of 25206501505217 is 71250510560252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23511724534321 + 1694776970896 = 4848889^2 + 1301836^2 .

It is a cyclic number.

It is not a de Polignac number, because 25206501505217 - 2²² = 25206497310913 is a prime.

It is not a weakly prime, because it can be changed into another prime (25206501505267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12603250752608 + 12603250752609.

It is an arithmetic number, because the mean of its divisors is an integer number (12603250752609).

Almost surely, 2^{25206501505217} is an apocalyptic number.

It is an amenable number.

25206501505217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25206501505217 is an equidigital number, since it uses as much as digits as its factorization.

25206501505217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210000, while the sum is 41.

The spelling of 25206501505217 in words is "twenty-five trillion, two hundred six billion, five hundred one million, five hundred five thousand, two hundred seventeen".