18195616840 has 32 divisors (see below), whose sum is σ = 41892238080. Its totient is φ = 7108984512.

The previous prime is 18195616819. The next prime is 18195616841. The reversal of 18195616840 is 4861659181.

It is not an unprimeable number, because it can be changed into a prime (18195616841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5287704 + ... + 5291143.

It is an arithmetic number, because the mean of its divisors is an integer number (1309132440).

Almost surely, 2^18195616840 is an apocalyptic number.

18195616840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18195616840 is an abundant number, since it is smaller than the sum of its proper divisors (23696621240).

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

18195616840 is a wasteful number, since it uses less digits than its factorization.

18195616840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10578901 (or 10578897 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 49.

The spelling of 18195616840 in words is "eighteen billion, one hundred ninety-five million, six hundred sixteen thousand, eight hundred forty".