195847966821 has 24 divisors (see below), whose sum is σ = 288097930656. Its totient is φ = 118247812800.

The previous prime is 195847966807. The next prime is 195847966823. The reversal of 195847966821 is 128669748591.

195847966821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 195847966821 - 2⁹ = 195847966309 is a prime.

It is a super-2 number, since 2×195847966821² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195847966823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3617355 + ... + 3671096.

It is an arithmetic number, because the mean of its divisors is an integer number (12004080444).

Almost surely, 2^195847966821 is an apocalyptic number.

It is an amenable number.

195847966821 is a deficient number, since it is larger than the sum of its proper divisors (92249963835).

195847966821 is a wasteful number, since it uses less digits than its factorization.

195847966821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7288533 (or 7288520 counting only the distinct ones).

The product of its digits is 52254720, while the sum is 66.

The spelling of 195847966821 in words is "one hundred ninety-five billion, eight hundred forty-seven million, nine hundred sixty-six thousand, eight hundred twenty-one".