195923887249 has 2 divisors, whose sum is σ = 195923887250. Its totient is φ = 195923887248.

The previous prime is 195923887157. The next prime is 195923887259. The reversal of 195923887249 is 942788329591.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188176366849 + 7747520400 = 433793^2 + 88020^2 .

It is a cyclic number.

It is not a de Polignac number, because 195923887249 - 2¹⁵ = 195923854481 is a prime.

It is not a weakly prime, because it can be changed into another prime (195923887259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97961943624 + 97961943625.

It is an arithmetic number, because the mean of its divisors is an integer number (97961943625).

Almost surely, 2^195923887249 is an apocalyptic number.

It is an amenable number.

195923887249 is a deficient number, since it is larger than the sum of its proper divisors (1).

195923887249 is an equidigital number, since it uses as much as digits as its factorization.

195923887249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78382080, while the sum is 67.

The spelling of 195923887249 in words is "one hundred ninety-five billion, nine hundred twenty-three million, eight hundred eighty-seven thousand, two hundred forty-nine".