67163387281 has 3 divisors (see below), whose sum is σ = 67163646441. Its totient is φ = 67163128122.

The previous prime is 67163387257. The next prime is 67163387293. The reversal of 67163387281 is 18278336176.

The square root of 67163387281 is 259159.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 67163387281 - 2¹³ = 67163379089 is a prime.

It is a super-2 number, since 2×67163387281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67163387231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 129580 + ... + 388738.

It is an arithmetic number, because the mean of its divisors is an integer number (22387882147).

Almost surely, 2^67163387281 is an apocalyptic number.

67163387281 is the 259159-th square number.

67163387281 is the 129580-th centered octagonal number.

It is an amenable number.

67163387281 is a deficient number, since it is larger than the sum of its proper divisors (259160).

67163387281 is an frugal number, since it uses more digits than its factorization.

67163387281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518318 (or 259159 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 52.

The spelling of 67163387281 in words is "sixty-seven billion, one hundred sixty-three million, three hundred eighty-seven thousand, two hundred eighty-one".