19683802818 has 256 divisors, whose sum is σ = 50388480000. Its totient is φ = 5657693184.

The previous prime is 19683802781. The next prime is 19683802829. The reversal of 19683802818 is 81820838691.

It is a super-2 number, since 2×19683802818² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 98913483 + ... + 98913681.

It is an arithmetic number, because the mean of its divisors is an integer number (196830000).

Almost surely, 2^19683802818 is an apocalyptic number.

19683802818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 19683802818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25194240000).

19683802818 is an abundant number, since it is smaller than the sum of its proper divisors (30704677182).

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

19683802818 is a wasteful number, since it uses less digits than its factorization.

19683802818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 1327104, while the sum is 54.

The spelling of 19683802818 in words is "nineteen billion, six hundred eighty-three million, eight hundred two thousand, eight hundred eighteen".