18691946868 has 192 divisors, whose sum is σ = 53673984000. Its totient is φ = 4948231680.

The previous prime is 18691946831. The next prime is 18691946909. The reversal of 18691946868 is 86864919681.

It is a super-2 number, since 2×18691946868² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18691946799 and 18691946808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9589558 + ... + 9591506.

It is an arithmetic number, because the mean of its divisors is an integer number (279552000).

Almost surely, 2^18691946868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18691946868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26836992000).

18691946868 is an abundant number, since it is smaller than the sum of its proper divisors (34982037132).

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

18691946868 is a wasteful number, since it uses less digits than its factorization.

18691946868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2148 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 66.

The spelling of 18691946868 in words is "eighteen billion, six hundred ninety-one million, nine hundred forty-six thousand, eight hundred sixty-eight".