19406664049918 has 8 divisors (see below), whose sum is σ = 29153250157248. Its totient is φ = 9688913997504.

The previous prime is 19406664049889. The next prime is 19406664049919. The reversal of 19406664049918 is 81994046660491.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19406664049919) 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, 7209012046 + ... + 7209014737.

It is an arithmetic number, because the mean of its divisors is an integer number (3644156269656).

Almost surely, 2^{19406664049918} is an apocalyptic number.

19406664049918 is a deficient number, since it is larger than the sum of its proper divisors (9746586107330).

19406664049918 is a wasteful number, since it uses less digits than its factorization.

19406664049918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14418027458.

The product of its (nonzero) digits is 80621568, while the sum is 67.

The spelling of 19406664049918 in words is "nineteen trillion, four hundred six billion, six hundred sixty-four million, forty-nine thousand, nine hundred eighteen".