19944319807 has 2 divisors, whose sum is σ = 19944319808. Its totient is φ = 19944319806.

The previous prime is 19944319789. The next prime is 19944319859. The reversal of 19944319807 is 70891344991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19944319807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19944119807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9972159903 + 9972159904.

It is an arithmetic number, because the mean of its divisors is an integer number (9972159904).

Almost surely, 2^19944319807 is an apocalyptic number.

19944319807 is a deficient number, since it is larger than the sum of its proper divisors (1).

19944319807 is an equidigital number, since it uses as much as digits as its factorization.

19944319807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 55.

The spelling of 19944319807 in words is "nineteen billion, nine hundred forty-four million, three hundred nineteen thousand, eight hundred seven".