18199309686 has 16 divisors (see below), whose sum is σ = 37572768768. Its totient is φ = 5870745000.

The previous prime is 18199309669. The next prime is 18199309699. The reversal of 18199309686 is 68690399181.

It is a super-4 number, since 4×18199309686⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48922690 + ... + 48923061.

It is an arithmetic number, because the mean of its divisors is an integer number (2348298048).

Almost surely, 2^18199309686 is an apocalyptic number.

18199309686 is an abundant number, since it is smaller than the sum of its proper divisors (19373459082).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18199309686 is a wasteful number, since it uses less digits than its factorization.

18199309686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97845787.

The product of its (nonzero) digits is 5038848, while the sum is 60.

The spelling of 18199309686 in words is "eighteen billion, one hundred ninety-nine million, three hundred nine thousand, six hundred eighty-six".