326887112581 has 2 divisors, whose sum is σ = 326887112582. Its totient is φ = 326887112580.

The previous prime is 326887112579. The next prime is 326887112621. The reversal of 326887112581 is 185211788623.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 324865800900 + 2021311681 = 569970^2 + 44959^2 .

It is an emirp because it is prime and its reverse (185211788623) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 326887112581 - 2¹ = 326887112579 is a prime.

It is a super-2 number, since 2×326887112581² (a number of 24 digits) contains 22 as substring.

Together with 326887112579, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (326887112551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163443556290 + 163443556291.

It is an arithmetic number, because the mean of its divisors is an integer number (163443556291).

Almost surely, 2^326887112581 is an apocalyptic number.

It is an amenable number.

326887112581 is a deficient number, since it is larger than the sum of its proper divisors (1).

326887112581 is an equidigital number, since it uses as much as digits as its factorization.

326887112581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 52.

The spelling of 326887112581 in words is "three hundred twenty-six billion, eight hundred eighty-seven million, one hundred twelve thousand, five hundred eighty-one".