19793444057 has 4 divisors (see below), whose sum is σ = 19892908800. Its totient is φ = 19693979316.

The previous prime is 19793444051. The next prime is 19793444059. The reversal of 19793444057 is 75044439791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19793444057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19793444051) 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, 49732073 + ... + 49732470.

It is an arithmetic number, because the mean of its divisors is an integer number (4973227200).

Almost surely, 2^19793444057 is an apocalyptic number.

It is an amenable number.

19793444057 is a deficient number, since it is larger than the sum of its proper divisors (99464743).

19793444057 is an equidigital number, since it uses as much as digits as its factorization.

19793444057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99464742.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 19793444057 in words is "nineteen billion, seven hundred ninety-three million, four hundred forty-four thousand, fifty-seven".