19338774638 has 4 divisors (see below), whose sum is σ = 29008161960. Its totient is φ = 9669387318.

The previous prime is 19338774629. The next prime is 19338774683. The reversal of 19338774638 is 83647783391.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83647783391 = 9337 ⋅8958743.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4834693658 + ... + 4834693661.

It is an arithmetic number, because the mean of its divisors is an integer number (7252040490).

Almost surely, 2^19338774638 is an apocalyptic number.

19338774638 is a deficient number, since it is larger than the sum of its proper divisors (9669387322).

19338774638 is an equidigital number, since it uses as much as digits as its factorization.

19338774638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9669387321.

The product of its digits is 18289152, while the sum is 59.

The spelling of 19338774638 in words is "nineteen billion, three hundred thirty-eight million, seven hundred seventy-four thousand, six hundred thirty-eight".