25251448217 has 2 divisors, whose sum is σ = 25251448218. Its totient is φ = 25251448216.

The previous prime is 25251448169. The next prime is 25251448231. The reversal of 25251448217 is 71284415252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13006033936 + 12245414281 = 114044^2 + 110659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25251448217 is a prime.

It is not a weakly prime, because it can be changed into another prime (25251448237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12625724108 + 12625724109.

It is an arithmetic number, because the mean of its divisors is an integer number (12625724109).

Almost surely, 2^25251448217 is an apocalyptic number.

It is an amenable number.

25251448217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25251448217 is an equidigital number, since it uses as much as digits as its factorization.

25251448217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179200, while the sum is 41.

The spelling of 25251448217 in words is "twenty-five billion, two hundred fifty-one million, four hundred forty-eight thousand, two hundred seventeen".