18126474817 has 6 divisors (see below), whose sum is σ = 19924141874. Its totient is φ = 16478613360.

The previous prime is 18126474809. The next prime is 18126474881. The reversal of 18126474817 is 71847462181.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 16461916416 + 1664558401 = 128304^2 + 40799^2 .

It is not a de Polignac number, because 18126474817 - 2³ = 18126474809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18126474017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74902668 + ... + 74902909.

Almost surely, 2^18126474817 is an apocalyptic number.

It is an amenable number.

18126474817 is a deficient number, since it is larger than the sum of its proper divisors (1797667057).

18126474817 is a wasteful number, since it uses less digits than its factorization.

18126474817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149805599 (or 149805588 counting only the distinct ones).

The product of its digits is 602112, while the sum is 49.

The spelling of 18126474817 in words is "eighteen billion, one hundred twenty-six million, four hundred seventy-four thousand, eight hundred seventeen".