195923972789 has 2 divisors, whose sum is σ = 195923972790. Its totient is φ = 195923972788.

The previous prime is 195923972753. The next prime is 195923972807. The reversal of 195923972789 is 987279329591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 195923972689 + 100 = 442633^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 195923972789 - 2⁸ = 195923972533 is a prime.

It is a super-2 number, since 2×195923972789² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (195923972729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97961986394 + 97961986395.

It is an arithmetic number, because the mean of its divisors is an integer number (97961986395).

Almost surely, 2^195923972789 is an apocalyptic number.

It is an amenable number.

195923972789 is a deficient number, since it is larger than the sum of its proper divisors (1).

195923972789 is an equidigital number, since it uses as much as digits as its factorization.

195923972789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 154314720, while the sum is 71.

The spelling of 195923972789 in words is "one hundred ninety-five billion, nine hundred twenty-three million, nine hundred seventy-two thousand, seven hundred eighty-nine".