25851442513 has 8 divisors (see below), whose sum is σ = 29477663208. Its totient is φ = 22459171584.

The previous prime is 25851442511. The next prime is 25851442517. The reversal of 25851442513 is 31524415852.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 687331089 + 25164111424 = 26217^2 + 158632^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25851442513 - 2¹ = 25851442511 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25851442511) 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 7 ways as a sum of consecutive naturals, for example, 58487206 + ... + 58487647.

It is an arithmetic number, because the mean of its divisors is an integer number (3684707901).

Almost surely, 2^25851442513 is an apocalyptic number.

It is an amenable number.

25851442513 is a deficient number, since it is larger than the sum of its proper divisors (3626220695).

25851442513 is a wasteful number, since it uses less digits than its factorization.

25851442513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116974883.

The product of its digits is 192000, while the sum is 40.

The spelling of 25851442513 in words is "twenty-five billion, eight hundred fifty-one million, four hundred forty-two thousand, five hundred thirteen".