195553673281 has 16 divisors (see below), whose sum is σ = 203662956544. Its totient is φ = 187611427584.

The previous prime is 195553673269. The next prime is 195553673309. The reversal of 195553673281 is 182376355591.

It is a happy number.

It is a 3-Lehmer number, since φ(195553673281) divides (195553673281-1)³.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 195553673281 - 2²⁹ = 195016802369 is a prime.

It is a super-2 number, since 2×195553673281² (a number of 23 digits) contains 22 as substring.

It is a deceptive number, since it divides R_195553673280.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195553673221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 638281 + ... + 893593.

It is an arithmetic number, because the mean of its divisors is an integer number (12728934784).

It is a Poulet number, since it divides 2^195553673280-1.

Almost surely, 2^195553673281 is an apocalyptic number.

195553673281 is the 255313-rd octagonal number.

It is an amenable number.

195553673281 is a deficient number, since it is larger than the sum of its proper divisors (8109283263).

195553673281 is a wasteful number, since it uses less digits than its factorization.

195553673281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255640.

The product of its digits is 6804000, while the sum is 55.

The spelling of 195553673281 in words is "one hundred ninety-five billion, five hundred fifty-three million, six hundred seventy-three thousand, two hundred eighty-one".