195388663680 has 384 divisors, whose sum is σ = 785644816320. Its totient is φ = 43817140224.

The previous prime is 195388663607. The next prime is 195388663699. The reversal of 195388663680 is 86366883591.

195388663680 is a `hidden beast` number, since 1 + 9 + 538 + 8 + 66 + 36 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a super-2 number, since 2×195388663680² (a number of 23 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2091244 + ... + 2182676.

Almost surely, 2^195388663680 is an apocalyptic number.

195388663680 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 195388663680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (392822408160).

195388663680 is an abundant number, since it is smaller than the sum of its proper divisors (590256152640).

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

195388663680 is a wasteful number, since it uses less digits than its factorization.

195388663680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91518 (or 91503 counting only the distinct ones).

The product of its (nonzero) digits is 44789760, while the sum is 63.

The spelling of 195388663680 in words is "one hundred ninety-five billion, three hundred eighty-eight million, six hundred sixty-three thousand, six hundred eighty".