18578421325 has 6 divisors (see below), whose sum is σ = 23037242474. Its totient is φ = 14862737040.

The previous prime is 18578421271. The next prime is 18578421359. The reversal of 18578421325 is 52312487581.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 165559689 + 18412861636 = 12867^2 + 135694^2 .

It is not a de Polignac number, because 18578421325 - 2⁹ = 18578420813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 371568402 + ... + 371568451.

Almost surely, 2^18578421325 is an apocalyptic number.

It is an amenable number.

18578421325 is a deficient number, since it is larger than the sum of its proper divisors (4458821149).

18578421325 is an equidigital number, since it uses as much as digits as its factorization.

18578421325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743136863 (or 743136858 counting only the distinct ones).

The product of its digits is 537600, while the sum is 46.

The spelling of 18578421325 in words is "eighteen billion, five hundred seventy-eight million, four hundred twenty-one thousand, three hundred twenty-five".