195612643573281 has 27 divisors (see below), whose sum is σ = 310573974975537. Its totient is φ = 118552837593960.

The previous prime is 195612643573253. The next prime is 195612643573307. The reversal of 195612643573281 is 182375346216591.

The square root of 195612643573281 is 13986159.

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

195612643573281 is a `hidden beast` number, since 1 + 9 + 5 + 6 + 12 + 6 + 43 + 573 + 2 + 8 + 1 = 666.

It is not a de Polignac number, because 195612643573281 - 2⁹ = 195612643572769 is a prime.

It is a super-2 number, since 2×195612643573281² (a number of 29 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (195612643573481) 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, 461331336 + ... + 461755158.

Almost surely, 2^{195612643573281} is an apocalyptic number.

195612643573281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

195612643573281 is the 13986159-th square number.

195612643573281 is the 6993080-th centered octagonal number.

It is an amenable number.

195612643573281 is a deficient number, since it is larger than the sum of its proper divisors (114961331402256).

195612643573281 is an frugal number, since it uses more digits than its factorization.

195612643573281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847674 (or 423837 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 63.

The spelling of 195612643573281 in words is "one hundred ninety-five trillion, six hundred twelve billion, six hundred forty-three million, five hundred seventy-three thousand, two hundred eighty-one".