18481865791 has 4 divisors (see below), whose sum is σ = 18569457784. Its totient is φ = 18394273800.

The previous prime is 18481865771. The next prime is 18481865807. The reversal of 18481865791 is 19756818481.

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 18481865791 - 2³³ = 9891931199 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 (18481865711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43795680 + ... + 43796101.

It is an arithmetic number, because the mean of its divisors is an integer number (4642364446).

Almost surely, 2^18481865791 is an apocalyptic number.

18481865791 is a deficient number, since it is larger than the sum of its proper divisors (87591993).

18481865791 is an equidigital number, since it uses as much as digits as its factorization.

18481865791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87591992.

The product of its digits is 3870720, while the sum is 58.

The spelling of 18481865791 in words is "eighteen billion, four hundred eighty-one million, eight hundred sixty-five thousand, seven hundred ninety-one".