18500018516842 has 4 divisors (see below), whose sum is σ = 27750027775266. Its totient is φ = 9250009258420.

The previous prime is 18500018516821. The next prime is 18500018516923. The reversal of 18500018516842 is 24861581000581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16361612412601 + 2138406104241 = 4044949^2 + 1462329^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4625004629209 + ... + 4625004629212.

Almost surely, 2^{18500018516842} is an apocalyptic number.

18500018516842 is a deficient number, since it is larger than the sum of its proper divisors (9250009258424).

18500018516842 is an equidigital number, since it uses as much as digits as its factorization.

18500018516842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250009258423.

The product of its (nonzero) digits is 614400, while the sum is 49.

The spelling of 18500018516842 in words is "eighteen trillion, five hundred billion, eighteen million, five hundred sixteen thousand, eight hundred forty-two".