25025917915997 has 2 divisors, whose sum is σ = 25025917915998. Its totient is φ = 25025917915996.

The previous prime is 25025917915963. The next prime is 25025917916059. The reversal of 25025917915997 is 79951971952052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23639880271396 + 1386037644601 = 4862086^2 + 1177301^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025917915997 - 2¹² = 25025917911901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25025917915997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25025917912997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12512958957998 + 12512958957999.

It is an arithmetic number, because the mean of its divisors is an integer number (12512958957999).

Almost surely, 2^{25025917915997} is an apocalyptic number.

It is an amenable number.

25025917915997 is a deficient number, since it is larger than the sum of its proper divisors (1).

25025917915997 is an equidigital number, since it uses as much as digits as its factorization.

25025917915997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160744500, while the sum is 71.

The spelling of 25025917915997 in words is "twenty-five trillion, twenty-five billion, nine hundred seventeen million, nine hundred fifteen thousand, nine hundred ninety-seven".