195923972688 has 40 divisors (see below), whose sum is σ = 506166659808. Its totient is φ = 65304154752.

The previous prime is 195923972677. The next prime is 195923972693. The reversal of 195923972688 is 886279329591.

It is a Cunningham number, because it is equal to 442633²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 774606 + ... + 995922.

Almost surely, 2^195923972688 is an apocalyptic number.

It is an amenable number.

195923972688 is an abundant number, since it is smaller than the sum of its proper divisors (310242687120).

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

195923972688 is a wasteful number, since it uses less digits than its factorization.

195923972688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239771 (or 239765 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 69.

It can be divided in two parts, 195923 and 972688, that added together give a palindrome (1168611).

The spelling of 195923972688 in words is "one hundred ninety-five billion, nine hundred twenty-three million, nine hundred seventy-two thousand, six hundred eighty-eight".