25025212217 has 2 divisors, whose sum is σ = 25025212218. Its totient is φ = 25025212216.

The previous prime is 25025212211. The next prime is 25025212297. The reversal of 25025212217 is 71221252052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23216921641 + 1808290576 = 152371^2 + 42524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25025212217 is a prime.

It is a super-2 number, since 2×25025212217² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25025212217.

It is not a weakly prime, because it can be changed into another prime (25025212211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12512606108 + 12512606109.

It is an arithmetic number, because the mean of its divisors is an integer number (12512606109).

Almost surely, 2^25025212217 is an apocalyptic number.

It is an amenable number.

25025212217 is a deficient number, since it is larger than the sum of its proper divisors (1).

25025212217 is an equidigital number, since it uses as much as digits as its factorization.

25025212217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5600, while the sum is 29.

Adding to 25025212217 its reverse (71221252052), we get a palindrome (96246464269).

The spelling of 25025212217 in words is "twenty-five billion, twenty-five million, two hundred twelve thousand, two hundred seventeen".