19856970403 has 4 divisors (see below), whose sum is σ = 20080082520. Its totient is φ = 19633858288.

The previous prime is 19856970383. The next prime is 19856970409. The reversal of 19856970403 is 30407965891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30407965891 = 1459 ⋅20841649.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19856970403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19856970409) 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, 111555925 + ... + 111556102.

It is an arithmetic number, because the mean of its divisors is an integer number (5020020630).

Almost surely, 2^19856970403 is an apocalyptic number.

19856970403 is a deficient number, since it is larger than the sum of its proper divisors (223112117).

19856970403 is an equidigital number, since it uses as much as digits as its factorization.

19856970403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223112116.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The spelling of 19856970403 in words is "nineteen billion, eight hundred fifty-six million, nine hundred seventy thousand, four hundred three".