25438974017 has 4 divisors (see below), whose sum is σ = 25440410820. Its totient is φ = 25437537216.

The previous prime is 25438974013. The next prime is 25438974019. The reversal of 25438974017 is 71047983452.

It is a Cunningham number, because it is equal to 159496²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14043198016 + 11395776001 = 118504^2 + 106751^2 .

It is a cyclic number.

It is not a de Polignac number, because 25438974017 - 2² = 25438974013 is a prime.

It is a super-2 number, since 2×25438974017² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25438974013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 691508 + ... + 727365.

It is an arithmetic number, because the mean of its divisors is an integer number (6360102705).

Almost surely, 2^25438974017 is an apocalyptic number.

It is an amenable number.

25438974017 is a deficient number, since it is larger than the sum of its proper divisors (1436803).

25438974017 is a wasteful number, since it uses less digits than its factorization.

25438974017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436802.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The spelling of 25438974017 in words is "twenty-five billion, four hundred thirty-eight million, nine hundred seventy-four thousand, seventeen".