18939950819 has 8 divisors (see below), whose sum is σ = 19347061248. Its totient is φ = 18533012680.

The previous prime is 18939950807. The next prime is 18939950849. The reversal of 18939950819 is 91805993981.

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

It is a cyclic number.

It is not a de Polignac number, because 18939950819 - 2⁴ = 18939950803 is a prime.

It is a super-2 number, since 2×18939950819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18939950849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192884 + ... + 274014.

It is an arithmetic number, because the mean of its divisors is an integer number (2418382656).

Almost surely, 2^18939950819 is an apocalyptic number.

18939950819 is a deficient number, since it is larger than the sum of its proper divisors (407110429).

18939950819 is an equidigital number, since it uses as much as digits as its factorization.

18939950819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86145.

The product of its (nonzero) digits is 6298560, while the sum is 62.

The spelling of 18939950819 in words is "eighteen billion, nine hundred thirty-nine million, nine hundred fifty thousand, eight hundred nineteen".