18909686345 has 16 divisors (see below), whose sum is σ = 24769886400. Its totient is φ = 13743950400.

The previous prime is 18909686329. The next prime is 18909686413. The reversal of 18909686345 is 54368690981.

It is not a de Polignac number, because 18909686345 - 2⁴ = 18909686329 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16895 + ... + 195204.

It is an arithmetic number, because the mean of its divisors is an integer number (1548117900).

Almost surely, 2^18909686345 is an apocalyptic number.

It is an amenable number.

18909686345 is a deficient number, since it is larger than the sum of its proper divisors (5860200055).

18909686345 is a wasteful number, since it uses less digits than its factorization.

18909686345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213736.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 18909686345 in words is "eighteen billion, nine hundred nine million, six hundred eighty-six thousand, three hundred forty-five".