19538909764919 has 4 divisors (see below), whose sum is σ = 19721516398344. Its totient is φ = 19356303131496.

The previous prime is 19538909764883. The next prime is 19538909764931. The reversal of 19538909764919 is 91946790983591.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19538909764919 is a prime.

It is a super-2 number, since 2×19538909764919² (a number of 27 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 (19538909764949) 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, 91303316552 + ... + 91303316765.

It is an arithmetic number, because the mean of its divisors is an integer number (4930379099586).

Almost surely, 2^{19538909764919} is an apocalyptic number.

19538909764919 is a deficient number, since it is larger than the sum of its proper divisors (182606633425).

19538909764919 is a wasteful number, since it uses less digits than its factorization.

19538909764919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182606633424.

The product of its (nonzero) digits is 1190427840, while the sum is 80.

The spelling of 19538909764919 in words is "nineteen trillion, five hundred thirty-eight billion, nine hundred nine million, seven hundred sixty-four thousand, nine hundred nineteen".