19718616319 has 16 divisors (see below), whose sum is σ = 20948863680. Its totient is φ = 18496304640.

The previous prime is 19718616299. The next prime is 19718616341. The reversal of 19718616319 is 91361681791.

It is not a de Polignac number, because 19718616319 - 2⁵ = 19718616287 is a prime.

It is a super-2 number, since 2×19718616319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19718616019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8450877 + ... + 8453209.

It is an arithmetic number, because the mean of its divisors is an integer number (1309303980).

Almost surely, 2^19718616319 is an apocalyptic number.

19718616319 is a deficient number, since it is larger than the sum of its proper divisors (1230247361).

19718616319 is a wasteful number, since it uses less digits than its factorization.

19718616319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3810.

The product of its digits is 489888, while the sum is 52.

The spelling of 19718616319 in words is "nineteen billion, seven hundred eighteen million, six hundred sixteen thousand, three hundred nineteen".