19791668197 has 16 divisors (see below), whose sum is σ = 22996956672. Its totient is φ = 16681029120.

The previous prime is 19791668191. The next prime is 19791668203. The reversal of 19791668197 is 79186619791.

It is an interprime number because it is at equal distance from previous prime (19791668191) and next prime (19791668203).

It is not a de Polignac number, because 19791668197 - 2¹⁹ = 19791143909 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 (19791668191) 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, 2105973 + ... + 2115349.

It is an arithmetic number, because the mean of its divisors is an integer number (1437309792).

Almost surely, 2^19791668197 is an apocalyptic number.

It is an amenable number.

19791668197 is a deficient number, since it is larger than the sum of its proper divisors (3205288475).

19791668197 is an equidigital number, since it uses as much as digits as its factorization.

19791668197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14388.

The product of its digits is 10287648, while the sum is 64.

The spelling of 19791668197 in words is "nineteen billion, seven hundred ninety-one million, six hundred sixty-eight thousand, one hundred ninety-seven".