19690433851 has 8 divisors (see below), whose sum is σ = 21670567344. Its totient is φ = 17741982720.

The previous prime is 19690433849. The next prime is 19690433927. The reversal of 19690433851 is 15833409691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19690433851 - 2¹ = 19690433849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19690433795 and 19690433804.

It is not an unprimeable number, because it can be changed into a prime (19690433801) 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 7 ways as a sum of consecutive naturals, for example, 7919286 + ... + 7921771.

It is an arithmetic number, because the mean of its divisors is an integer number (2708820918).

Almost surely, 2^19690433851 is an apocalyptic number.

19690433851 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19690433851 is a deficient number, since it is larger than the sum of its proper divisors (1980133493).

19690433851 is a wasteful number, since it uses less digits than its factorization.

19690433851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15841181.

The product of its (nonzero) digits is 699840, while the sum is 49.

The spelling of 19690433851 in words is "nineteen billion, six hundred ninety million, four hundred thirty-three thousand, eight hundred fifty-one".