19138648903 has 4 divisors (see below), whose sum is σ = 20878526088. Its totient is φ = 17398771720.

The previous prime is 19138648883. The next prime is 19138648913. The reversal of 19138648903 is 30984683191.

It is a happy number.

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

It is not a de Polignac number, because 19138648903 - 2⁹ = 19138648391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19138648913) 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, 869938576 + ... + 869938597.

It is an arithmetic number, because the mean of its divisors is an integer number (5219631522).

Almost surely, 2^19138648903 is an apocalyptic number.

19138648903 is a deficient number, since it is larger than the sum of its proper divisors (1739877185).

19138648903 is a wasteful number, since it uses less digits than its factorization.

19138648903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739877184.

The product of its (nonzero) digits is 1119744, while the sum is 52.

The spelling of 19138648903 in words is "nineteen billion, one hundred thirty-eight million, six hundred forty-eight thousand, nine hundred three".