19854323694 has 64 divisors (see below), whose sum is σ = 45235872000. Its totient is φ = 6451443936.

The previous prime is 19854323669. The next prime is 19854323707. The reversal of 19854323694 is 49632345891.

19854323694 is a `hidden beast` number, since 1 + 9 + 8 + 543 + 2 + 3 + 6 + 94 = 666.

It is a super-2 number, since 2×19854323694² (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 a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19854323694.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1206232 + ... + 1222580.

It is an arithmetic number, because the mean of its divisors is an integer number (706810500).

Almost surely, 2^19854323694 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19854323694, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22617936000).

19854323694 is an abundant number, since it is smaller than the sum of its proper divisors (25381548306).

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

19854323694 is a wasteful number, since it uses less digits than its factorization.

19854323694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16926 (or 16920 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The spelling of 19854323694 in words is "nineteen billion, eight hundred fifty-four million, three hundred twenty-three thousand, six hundred ninety-four".