18816107782 has 4 divisors (see below), whose sum is σ = 28224161676. Its totient is φ = 9408053890.

The previous prime is 18816107777. The next prime is 18816107803. The reversal of 18816107782 is 28770161881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28770161881 = 4079 ⋅7053239.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4704026944 + ... + 4704026947.

It is an arithmetic number, because the mean of its divisors is an integer number (7056040419).

Almost surely, 2^18816107782 is an apocalyptic number.

18816107782 is a deficient number, since it is larger than the sum of its proper divisors (9408053894).

18816107782 is an equidigital number, since it uses as much as digits as its factorization.

18816107782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9408053893.

The product of its (nonzero) digits is 301056, while the sum is 49.

The spelling of 18816107782 in words is "eighteen billion, eight hundred sixteen million, one hundred seven thousand, seven hundred eighty-two".