195327757681 has 27 divisors (see below), whose sum is σ = 239878446201. Its totient is φ = 158564282184.

The previous prime is 195327757663. The next prime is 195327757697. The reversal of 195327757681 is 186757723591.

The square root of 195327757681 is 441959.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 195327757681 - 2¹⁷ = 195327626609 is a prime.

It is a super-2 number, since 2×195327757681² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (195327757601) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 58778886 + ... + 58782208.

Almost surely, 2^195327757681 is an apocalyptic number.

195327757681 is the 441959-th square number.

195327757681 is the 220980-th centered octagonal number.

It is an amenable number.

195327757681 is a deficient number, since it is larger than the sum of its proper divisors (44550688520).

195327757681 is an frugal number, since it uses more digits than its factorization.

195327757681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6698 (or 3349 counting only the distinct ones).

The product of its digits is 22226400, while the sum is 61.

The spelling of 195327757681 in words is "one hundred ninety-five billion, three hundred twenty-seven million, seven hundred fifty-seven thousand, six hundred eighty-one".