193856768789 has 4 divisors (see below), whose sum is σ = 204059756640. Its totient is φ = 183653780940.

The previous prime is 193856768779. The next prime is 193856768801. The reversal of 193856768789 is 987867658391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 193856768789 - 2²⁴ = 193839991573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (193856768779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5101493897 + ... + 5101493934.

It is an arithmetic number, because the mean of its divisors is an integer number (51014939160).

Almost surely, 2^193856768789 is an apocalyptic number.

193856768789 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

193856768789 is a deficient number, since it is larger than the sum of its proper divisors (10202987851).

193856768789 is a wasteful number, since it uses less digits than its factorization.

193856768789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10202987850.

The product of its digits is 1097349120, while the sum is 77.

The spelling of 193856768789 in words is "one hundred ninety-three billion, eight hundred fifty-six million, seven hundred sixty-eight thousand, seven hundred eighty-nine".