195987891163668 has 24 divisors (see below), whose sum is σ = 459302044800480. Its totient is φ = 65044016280480.

The previous prime is 195987891163651. The next prime is 195987891163699. The reversal of 195987891163668 is 866361198789591.

It is a super-2 number, since 2×195987891163668² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35660093898 + ... + 35660099393.

It is an arithmetic number, because the mean of its divisors is an integer number (19137585200020).

Almost surely, 2^{195987891163668} is an apocalyptic number.

It is an amenable number.

195987891163668 is an abundant number, since it is smaller than the sum of its proper divisors (263314153636812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

195987891163668 is a wasteful number, since it uses less digits than its factorization.

195987891163668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71320193527 (or 71320193525 counting only the distinct ones).

The product of its digits is 8465264640, while the sum is 87.

The spelling of 195987891163668 in words is "one hundred ninety-five trillion, nine hundred eighty-seven billion, eight hundred ninety-one million, one hundred sixty-three thousand, six hundred sixty-eight".