18142479473 has 4 divisors (see below), whose sum is σ = 18145157028. Its totient is φ = 18139801920.

The previous prime is 18142479457. The next prime is 18142479493. The reversal of 18142479473 is 37497424181.

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 8059909729 + 10082569744 = 89777^2 + 100412^2 .

It is a cyclic number.

It is not a de Polignac number, because 18142479473 - 2⁴ = 18142479457 is a prime.

It is a super-2 number, since 2×18142479473² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18142479493) 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 3 ways as a sum of consecutive naturals, for example, 1328588 + ... + 1342173.

It is an arithmetic number, because the mean of its divisors is an integer number (4536289257).

Almost surely, 2^18142479473 is an apocalyptic number.

It is an amenable number.

18142479473 is a deficient number, since it is larger than the sum of its proper divisors (2677555).

18142479473 is an equidigital number, since it uses as much as digits as its factorization.

18142479473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2677554.

The product of its digits is 1354752, while the sum is 50.

The spelling of 18142479473 in words is "eighteen billion, one hundred forty-two million, four hundred seventy-nine thousand, four hundred seventy-three".