19854323693 has 16 divisors (see below), whose sum is σ = 20764719360. Its totient is φ = 18968005056.

The previous prime is 19854323669. The next prime is 19854323707. The reversal of 19854323693 is 39632345891.

It is a cyclic number.

It is not a de Polignac number, because 19854323693 - 2¹⁶ = 19854258157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19854323623) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 470498 + ... + 510956.

It is an arithmetic number, because the mean of its divisors is an integer number (1297794960).

Almost surely, 2^19854323693 is an apocalyptic number.

It is an amenable number.

19854323693 is a deficient number, since it is larger than the sum of its proper divisors (910395667).

19854323693 is a wasteful number, since it uses less digits than its factorization.

19854323693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40756.

The product of its digits is 4199040, while the sum is 53.

The spelling of 19854323693 in words is "nineteen billion, eight hundred fifty-four million, three hundred twenty-three thousand, six hundred ninety-three".