195189945720 has 384 divisors, whose sum is σ = 750480422400. Its totient is φ = 40156032000.

The previous prime is 195189945683. The next prime is 195189945733. The reversal of 195189945720 is 27549981591.

It is a super-2 number, since 2×195189945720² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6517741 + ... + 6547619.

It is an arithmetic number, because the mean of its divisors is an integer number (1954376100).

Almost surely, 2^195189945720 is an apocalyptic number.

195189945720 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 195189945720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375240211200).

195189945720 is an abundant number, since it is smaller than the sum of its proper divisors (555290476680).

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

195189945720 is a wasteful number, since it uses less digits than its factorization.

195189945720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30019 (or 30008 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 60.

The spelling of 195189945720 in words is "one hundred ninety-five billion, one hundred eighty-nine million, nine hundred forty-five thousand, seven hundred twenty".