18107072842 has 4 divisors (see below), whose sum is σ = 27160609266. Its totient is φ = 9053536420.

The previous prime is 18107072807. The next prime is 18107072881. The reversal of 18107072842 is 24827070181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24827070181 = 17 ⋅1460415893.

It can be written as a sum of positive squares in only one way, i.e., 18014739961 + 92332881 = 134219^2 + 9609^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18107072795 and 18107072804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4526768209 + ... + 4526768212.

Almost surely, 2^18107072842 is an apocalyptic number.

18107072842 is a deficient number, since it is larger than the sum of its proper divisors (9053536424).

18107072842 is an equidigital number, since it uses as much as digits as its factorization.

18107072842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9053536423.

The product of its (nonzero) digits is 50176, while the sum is 40.

The spelling of 18107072842 in words is "eighteen billion, one hundred seven million, seventy-two thousand, eight hundred forty-two".