19918692863 has 4 divisors (see below), whose sum is σ = 19941150000. Its totient is φ = 19896235728.

The previous prime is 19918692851. The next prime is 19918692877. The reversal of 19918692863 is 36829681991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19918692863 - 2⁴ = 19918692847 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19918692796 and 19918692805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19918692803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11227238 + ... + 11229011.

It is an arithmetic number, because the mean of its divisors is an integer number (4985287500).

Almost surely, 2^19918692863 is an apocalyptic number.

19918692863 is a deficient number, since it is larger than the sum of its proper divisors (22457137).

19918692863 is an equidigital number, since it uses as much as digits as its factorization.

19918692863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22457136.

The product of its digits is 10077696, while the sum is 62.

The spelling of 19918692863 in words is "nineteen billion, nine hundred eighteen million, six hundred ninety-two thousand, eight hundred sixty-three".