19642680018 has 48 divisors (see below), whose sum is σ = 47825668800. Its totient is φ = 5781121632.

The previous prime is 19642680017. The next prime is 19642680023. The reversal of 19642680018 is 81008624691.

It is not an unprimeable number, because it can be changed into a prime (19642680011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1819468 + ... + 1830231.

It is an arithmetic number, because the mean of its divisors is an integer number (996368100).

Almost surely, 2^19642680018 is an apocalyptic number.

19642680018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19642680018 is an abundant number, since it is smaller than the sum of its proper divisors (28182988782).

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

19642680018 is a wasteful number, since it uses less digits than its factorization.

19642680018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3649743 (or 3649740 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 19642680018 in words is "nineteen billion, six hundred forty-two million, six hundred eighty thousand, eighteen".