19844135357 has 8 divisors (see below), whose sum is σ = 20071022400. Its totient is φ = 19617335584.

The previous prime is 19844135323. The next prime is 19844135387. The reversal of 19844135357 is 75353144891.

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 19844135357 - 2¹⁶ = 19844069821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19844135387) 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, 508694 + ... + 546312.

It is an arithmetic number, because the mean of its divisors is an integer number (2508877800).

Almost surely, 2^19844135357 is an apocalyptic number.

It is an amenable number.

19844135357 is a deficient number, since it is larger than the sum of its proper divisors (226887043).

19844135357 is an equidigital number, since it uses as much as digits as its factorization.

19844135357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43635.

The product of its digits is 1814400, while the sum is 50.

The spelling of 19844135357 in words is "nineteen billion, eight hundred forty-four million, one hundred thirty-five thousand, three hundred fifty-seven".