195917969520 has 960 divisors, whose sum is σ = 856775162880. Its totient is φ = 38961119232.

The previous prime is 195917969483. The next prime is 195917969521. The reversal of 195917969520 is 25969719591.

195917969520 is a `hidden beast` number, since 1 + 9 + 5 + 9 + 17 + 96 + 9 + 520 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195917969521) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 419524327 + ... + 419524793.

It is an arithmetic number, because the mean of its divisors is an integer number (892474128).

Almost surely, 2^195917969520 is an apocalyptic number.

195917969520 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 195917969520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428387581440).

195917969520 is an abundant number, since it is smaller than the sum of its proper divisors (660857193360).

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

195917969520 is a wasteful number, since it uses less digits than its factorization.

195917969520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862 (or 853 counting only the distinct ones).

The product of its (nonzero) digits is 13778100, while the sum is 63.

The spelling of 195917969520 in words is "one hundred ninety-five billion, nine hundred seventeen million, nine hundred sixty-nine thousand, five hundred twenty".