19797095809 has 16 divisors (see below), whose sum is σ = 21050772480. Its totient is φ = 18564878160.

The previous prime is 19797095779. The next prime is 19797095827. The reversal of 19797095809 is 90859079791.

It is a cyclic number.

It is not a de Polignac number, because 19797095809 - 2¹³ = 19797087617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19797095909) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3133764 + ... + 3140074.

It is an arithmetic number, because the mean of its divisors is an integer number (1315673280).

Almost surely, 2^19797095809 is an apocalyptic number.

19797095809 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

19797095809 is a deficient number, since it is larger than the sum of its proper divisors (1253676671).

19797095809 is a wasteful number, since it uses less digits than its factorization.

19797095809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7980.

The product of its (nonzero) digits is 12859560, while the sum is 64.

The spelling of 19797095809 in words is "nineteen billion, seven hundred ninety-seven million, ninety-five thousand, eight hundred nine".