25197989717 has 4 divisors (see below), whose sum is σ = 25433485056. Its totient is φ = 24962494380.

The previous prime is 25197989711. The next prime is 25197989737. The reversal of 25197989717 is 71798979152.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25197989717 - 2⁴ = 25197989701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25197989711) 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 3 ways as a sum of consecutive naturals, for example, 117747509 + ... + 117747722.

It is an arithmetic number, because the mean of its divisors is an integer number (6358371264).

Almost surely, 2^25197989717 is an apocalyptic number.

It is an amenable number.

25197989717 is a deficient number, since it is larger than the sum of its proper divisors (235495339).

25197989717 is a wasteful number, since it uses less digits than its factorization.

25197989717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235495338.

The product of its digits is 20003760, while the sum is 65.

The spelling of 25197989717 in words is "twenty-five billion, one hundred ninety-seven million, nine hundred eighty-nine thousand, seven hundred seventeen".