195865721856 has 264 divisors, whose sum is σ = 647094364800. Its totient is φ = 55897399296.

The previous prime is 195865721813. The next prime is 195865721879. The reversal of 195865721856 is 658127568591.

195865721856 is a `hidden beast` number, since 1 + 9 + 5 + 8 + 6 + 572 + 1 + 8 + 56 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 195865721793 and 195865721802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 109604995 + ... + 109606781.

Almost surely, 2^195865721856 is an apocalyptic number.

195865721856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 195865721856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323547182400).

195865721856 is an abundant number, since it is smaller than the sum of its proper divisors (451228642944).

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

195865721856 is a wasteful number, since it uses less digits than its factorization.

195865721856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519 (or 3498 counting only the distinct ones).

The product of its digits is 36288000, while the sum is 63.

The spelling of 195865721856 in words is "one hundred ninety-five billion, eight hundred sixty-five million, seven hundred twenty-one thousand, eight hundred fifty-six".