195861539520 has 672 divisors, whose sum is σ = 737843258880. Its totient is φ = 47516958720.

The previous prime is 195861539509. The next prime is 195861539537. The reversal of 195861539520 is 25935168591.

195861539520 is a `hidden beast` number, since 1 + 9 + 5 + 8 + 61 + 53 + 9 + 520 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 150315189 + ... + 150316491.

It is an arithmetic number, because the mean of its divisors is an integer number (1097981040).

Almost surely, 2^195861539520 is an apocalyptic number.

195861539520 is a gapful number since it is divisible by the number (10) 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 195861539520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (368921629440).

195861539520 is an abundant number, since it is smaller than the sum of its proper divisors (541981719360).

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

195861539520 is a wasteful number, since it uses less digits than its factorization.

195861539520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 2916000, while the sum is 54.

The spelling of 195861539520 in words is "one hundred ninety-five billion, eight hundred sixty-one million, five hundred thirty-nine thousand, five hundred twenty".