18447223625 has 8 divisors (see below), whose sum is σ = 23022135240. Its totient is φ = 14757778800.

The previous prime is 18447223573. The next prime is 18447223637. The reversal of 18447223625 is 52632274481.

It can be written as a sum of positive squares in 4 ways, for example, as 116229961 + 18330993664 = 10781^2 + 135392^2 .

It is not a de Polignac number, because 18447223625 - 2¹⁰ = 18447222601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73788770 + ... + 73789019.

It is an arithmetic number, because the mean of its divisors is an integer number (2877766905).

Almost surely, 2^18447223625 is an apocalyptic number.

It is an amenable number.

18447223625 is a deficient number, since it is larger than the sum of its proper divisors (4574911615).

18447223625 is an equidigital number, since it uses as much as digits as its factorization.

18447223625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147577804 (or 147577794 counting only the distinct ones).

The product of its digits is 645120, while the sum is 44.

The spelling of 18447223625 in words is "eighteen billion, four hundred forty-seven million, two hundred twenty-three thousand, six hundred twenty-five".