19969277897 has 4 divisors (see below), whose sum is σ = 19969745796. Its totient is φ = 19968810000.

The previous prime is 19969277869. The next prime is 19969277899. The reversal of 19969277897 is 79877296991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5135012281 + 14834265616 = 71659^2 + 121796^2 .

It is a cyclic number.

It is not a de Polignac number, because 19969277897 - 2³⁰ = 18895536073 is a prime.

It is a super-2 number, since 2×19969277897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19969277899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162698 + ... + 257699.

It is an arithmetic number, because the mean of its divisors is an integer number (4992436449).

Almost surely, 2^19969277897 is an apocalyptic number.

It is an amenable number.

19969277897 is a deficient number, since it is larger than the sum of its proper divisors (467899).

19969277897 is an equidigital number, since it uses as much as digits as its factorization.

19969277897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467898.

The product of its digits is 216040608, while the sum is 74.

The spelling of 19969277897 in words is "nineteen billion, nine hundred sixty-nine million, two hundred seventy-seven thousand, eight hundred ninety-seven".