195956220287 has 4 divisors (see below), whose sum is σ = 200735640336. Its totient is φ = 191176800240.

The previous prime is 195956220277. The next prime is 195956220319. The reversal of 195956220287 is 782022659591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 782022659591 = 59 ⋅13254621349.

It is a cyclic number.

It is not a de Polignac number, because 195956220287 - 2⁶ = 195956220223 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 (195956220277) 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, 2389709963 + ... + 2389710044.

It is an arithmetic number, because the mean of its divisors is an integer number (50183910084).

Almost surely, 2^195956220287 is an apocalyptic number.

195956220287 is a deficient number, since it is larger than the sum of its proper divisors (4779420049).

195956220287 is an equidigital number, since it uses as much as digits as its factorization.

195956220287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4779420048.

The product of its (nonzero) digits is 5443200, while the sum is 56.

The spelling of 195956220287 in words is "one hundred ninety-five billion, nine hundred fifty-six million, two hundred twenty thousand, two hundred eighty-seven".