19806703573 has 2 divisors, whose sum is σ = 19806703574. Its totient is φ = 19806703572.

The previous prime is 19806703561. The next prime is 19806703583. The reversal of 19806703573 is 37530760891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19294043409 + 512660164 = 138903^2 + 22642^2 .

It is a cyclic number.

It is not a de Polignac number, because 19806703573 - 2⁵ = 19806703541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19806703513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9903351786 + 9903351787.

It is an arithmetic number, because the mean of its divisors is an integer number (9903351787).

Almost surely, 2^19806703573 is an apocalyptic number.

It is an amenable number.

19806703573 is a deficient number, since it is larger than the sum of its proper divisors (1).

19806703573 is an equidigital number, since it uses as much as digits as its factorization.

19806703573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 49.

The spelling of 19806703573 in words is "nineteen billion, eight hundred six million, seven hundred three thousand, five hundred seventy-three".