19839466493891 has 8 divisors (see below), whose sum is σ = 21801032857584. Its totient is φ = 17904229880320.

The previous prime is 19839466493887. The next prime is 19839466493909.

19839466493891 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19839466493891 - 2² = 19839466493887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19839466493881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6582435950 + ... + 6582438963.

It is an arithmetic number, because the mean of its divisors is an integer number (2725129107198).

Almost surely, 2^{19839466493891} is an apocalyptic number.

19839466493891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19839466493891 is a deficient number, since it is larger than the sum of its proper divisors (1961566363693).

19839466493891 is a wasteful number, since it uses less digits than its factorization.

19839466493891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13164875061.

The product of its digits is 2176782336, while the sum is 80.

The spelling of 19839466493891 in words is "nineteen trillion, eight hundred thirty-nine billion, four hundred sixty-six million, four hundred ninety-three thousand, eight hundred ninety-one".