25217120217 has 8 divisors (see below), whose sum is σ = 33829102624. Its totient is φ = 16708275648.

The previous prime is 25217120191. The next prime is 25217120239. The reversal of 25217120217 is 71202171252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25217120217 - 2¹¹ = 25217118169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25217120287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25783888 + ... + 25784865.

It is an arithmetic number, because the mean of its divisors is an integer number (4228637828).

Almost surely, 2^25217120217 is an apocalyptic number.

It is an amenable number.

25217120217 is a deficient number, since it is larger than the sum of its proper divisors (8611982407).

25217120217 is a wasteful number, since it uses less digits than its factorization.

25217120217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51568919.

The product of its (nonzero) digits is 3920, while the sum is 30.

Adding to 25217120217 its reverse (71202171252), we get a palindrome (96419291469).

The spelling of 25217120217 in words is "twenty-five billion, two hundred seventeen million, one hundred twenty thousand, two hundred seventeen".