195158994889 has 4 divisors (see below), whose sum is σ = 195774638724. Its totient is φ = 194543351056.

The previous prime is 195158994881. The next prime is 195158994941. The reversal of 195158994889 is 988499851591.

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 13802255289 + 181356739600 = 117483^2 + 425860^2 .

It is a cyclic number.

It is not a de Polignac number, because 195158994889 - 2³ = 195158994881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195158994881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 307821442 + ... + 307822075.

It is an arithmetic number, because the mean of its divisors is an integer number (48943659681).

Almost surely, 2^195158994889 is an apocalyptic number.

It is an amenable number.

195158994889 is a deficient number, since it is larger than the sum of its proper divisors (615643835).

195158994889 is an equidigital number, since it uses as much as digits as its factorization.

195158994889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615643834.

The product of its digits is 335923200, while the sum is 76.

The spelling of 195158994889 in words is "one hundred ninety-five billion, one hundred fifty-eight million, nine hundred ninety-four thousand, eight hundred eighty-nine".