19138194736 has 20 divisors (see below), whose sum is σ = 37086980200. Its totient is φ = 9567361152.

The previous prime is 19138194727. The next prime is 19138194749. The reversal of 19138194736 is 63749183191.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15141 + ... + 196228.

It is an arithmetic number, because the mean of its divisors is an integer number (1854349010).

Almost surely, 2^19138194736 is an apocalyptic number.

19138194736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19138194736 is a deficient number, since it is larger than the sum of its proper divisors (17948785464).

19138194736 is a wasteful number, since it uses less digits than its factorization.

19138194736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217036 (or 217030 counting only the distinct ones).

The product of its digits is 979776, while the sum is 52.

The spelling of 19138194736 in words is "nineteen billion, one hundred thirty-eight million, one hundred ninety-four thousand, seven hundred thirty-six".