18427216899 has 96 divisors (see below), whose sum is σ = 32623772160. Its totient is φ = 9144576000.

The previous prime is 18427216897. The next prime is 18427216919. The reversal of 18427216899 is 99861272481.

It is not a de Polignac number, because 18427216899 - 2¹ = 18427216897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (18427216891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5480979 + ... + 5484339.

It is an arithmetic number, because the mean of its divisors is an integer number (339830960).

Almost surely, 2^18427216899 is an apocalyptic number.

18427216899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18427216899 is a deficient number, since it is larger than the sum of its proper divisors (14196555261).

18427216899 is a wasteful number, since it uses less digits than its factorization.

18427216899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561 (or 3554 counting only the distinct ones).

The product of its digits is 3483648, while the sum is 57.

The spelling of 18427216899 in words is "eighteen billion, four hundred twenty-seven million, two hundred sixteen thousand, eight hundred ninety-nine".