19198936797 has 4 divisors (see below), whose sum is σ = 25598582400. Its totient is φ = 12799291196.

The previous prime is 19198936793. The next prime is 19198936811. The reversal of 19198936797 is 79763989191.

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 not a de Polignac number, because 19198936797 - 2² = 19198936793 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19198936793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3199822797 + ... + 3199822802.

It is an arithmetic number, because the mean of its divisors is an integer number (6399645600).

Almost surely, 2^19198936797 is an apocalyptic number.

It is an amenable number.

19198936797 is a deficient number, since it is larger than the sum of its proper divisors (6399645603).

19198936797 is an equidigital number, since it uses as much as digits as its factorization.

19198936797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399645602.

The product of its digits is 46294416, while the sum is 69.

The spelling of 19198936797 in words is "nineteen billion, one hundred ninety-eight million, nine hundred thirty-six thousand, seven hundred ninety-seven".