19017539138 has 16 divisors (see below), whose sum is σ = 31469925816. Its totient is φ = 8563244160.

The previous prime is 19017539083. The next prime is 19017539153. The reversal of 19017539138 is 83193571091.

It can be written as a sum of positive squares in 4 ways, for example, as 11602090369 + 7415448769 = 107713^2 + 86113^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19017539092 and 19017539101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8918981 + ... + 8921112.

Almost surely, 2^19017539138 is an apocalyptic number.

19017539138 is a deficient number, since it is larger than the sum of its proper divisors (12452386678).

19017539138 is a wasteful number, since it uses less digits than its factorization.

19017539138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17840149.

The product of its (nonzero) digits is 204120, while the sum is 47.

The spelling of 19017539138 in words is "nineteen billion, seventeen million, five hundred thirty-nine thousand, one hundred thirty-eight".