195853710981 has 4 divisors (see below), whose sum is σ = 261138281312. Its totient is φ = 130569140652.

The previous prime is 195853710979. The next prime is 195853710991. The reversal of 195853710981 is 189017358591.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 195853710981 - 2¹ = 195853710979 is a prime.

It is a super-2 number, since 2×195853710981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195853710991) 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, 32642285161 + ... + 32642285166.

It is an arithmetic number, because the mean of its divisors is an integer number (65284570328).

Almost surely, 2^195853710981 is an apocalyptic number.

It is an amenable number.

195853710981 is a deficient number, since it is larger than the sum of its proper divisors (65284570331).

195853710981 is an equidigital number, since it uses as much as digits as its factorization.

195853710981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65284570330.

The product of its (nonzero) digits is 2721600, while the sum is 57.

The spelling of 195853710981 in words is "one hundred ninety-five billion, eight hundred fifty-three million, seven hundred ten thousand, nine hundred eighty-one".