18766798847 has 4 divisors (see below), whose sum is σ = 18879175056. Its totient is φ = 18654422640.

The previous prime is 18766798837. The next prime is 18766798849. The reversal of 18766798847 is 74889766781.

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

It is a cyclic number.

It is not a de Polignac number, because 18766798847 - 2¹⁰ = 18766797823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18766798849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56187854 + ... + 56188187.

It is an arithmetic number, because the mean of its divisors is an integer number (4719793764).

Almost surely, 2^18766798847 is an apocalyptic number.

18766798847 is a deficient number, since it is larger than the sum of its proper divisors (112376209).

18766798847 is a wasteful number, since it uses less digits than its factorization.

18766798847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112376208.

The product of its digits is 227598336, while the sum is 71.

The spelling of 18766798847 in words is "eighteen billion, seven hundred sixty-six million, seven hundred ninety-eight thousand, eight hundred forty-seven".