18949051138 has 8 divisors (see below), whose sum is σ = 28425131280. Its totient is φ = 9474007380.

The previous prime is 18949051133. The next prime is 18949051157. The reversal of 18949051138 is 83115094981.

18949051138 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 18949051091 and 18949051100.

It is not an unprimeable number, because it can be changed into a prime (18949051133) 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, 211648 + ... + 287563.

It is an arithmetic number, because the mean of its divisors is an integer number (3553141410).

Almost surely, 2^18949051138 is an apocalyptic number.

18949051138 is a deficient number, since it is larger than the sum of its proper divisors (9476080142).

18949051138 is a wasteful number, since it uses less digits than its factorization.

18949051138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518192.

The product of its (nonzero) digits is 311040, while the sum is 49.

The spelling of 18949051138 in words is "eighteen billion, nine hundred forty-nine million, fifty-one thousand, one hundred thirty-eight".