18349878729 has 144 divisors (see below), whose sum is σ = 32913937728. Its totient is φ = 9010020096.

The previous prime is 18349878719. The next prime is 18349878733. The reversal of 18349878729 is 92787894381.

It is not a de Polignac number, because 18349878729 - 2⁷ = 18349878601 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 18349878729.

It is not an unprimeable number, because it can be changed into a prime (18349878719) 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 143 ways as a sum of consecutive naturals, for example, 46221159 + ... + 46221555.

It is an arithmetic number, because the mean of its divisors is an integer number (228569012).

Almost surely, 2^18349878729 is an apocalyptic number.

18349878729 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18349878729 is a deficient number, since it is larger than the sum of its proper divisors (14564058999).

18349878729 is a wasteful number, since it uses less digits than its factorization.

18349878729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 506 counting only the distinct ones).

The product of its digits is 48771072, while the sum is 66.

The spelling of 18349878729 in words is "eighteen billion, three hundred forty-nine million, eight hundred seventy-eight thousand, seven hundred twenty-nine".