195984420991 has 8 divisors (see below), whose sum is σ = 203062551984. Its totient is φ = 189000040320.

The previous prime is 195984420979. The next prime is 195984420997. The reversal of 195984420991 is 199024489591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 195984420991 - 2⁹ = 195984420479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195984420997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23433325 + ... + 23441686.

It is an arithmetic number, because the mean of its divisors is an integer number (25382818998).

Almost surely, 2^195984420991 is an apocalyptic number.

195984420991 is a deficient number, since it is larger than the sum of its proper divisors (7078130993).

195984420991 is a wasteful number, since it uses less digits than its factorization.

195984420991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46875161.

The product of its (nonzero) digits is 8398080, while the sum is 61.

The spelling of 195984420991 in words is "one hundred ninety-five billion, nine hundred eighty-four million, four hundred twenty thousand, nine hundred ninety-one".