188881818188881 has 2 divisors, whose sum is σ = 188881818188882. Its totient is φ = 188881818188880.

The previous prime is 188881818188867. The next prime is 188881818188909.

188881818188881 is nontrivially palindromic in base 10.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131842845856656 + 57038972332225 = 11482284^2 + 7552415^2 .

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 188881818188881 - 2⁹ = 188881818188369 is a prime.

It is a super-2 number, since 2×188881818188881² (a number of 29 digits) contains 22 as substring.

188881818188881 is a strobogrammatic number because it is the same when read upside-down.

It is not a weakly prime, because it can be changed into another prime (188881818188821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94440909094440 + 94440909094441.

It is an arithmetic number, because the mean of its divisors is an integer number (94440909094441).

Almost surely, 2^{188881818188881} is an apocalyptic number.

It is an amenable number.

188881818188881 is a deficient number, since it is larger than the sum of its proper divisors (1).

188881818188881 is an equidigital number, since it uses as much as digits as its factorization.

188881818188881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1073741824, while the sum is 85.

The spelling of 188881818188881 in words is "one hundred eighty-eight trillion, eight hundred eighty-one billion, eight hundred eighteen million, one hundred eighty-eight thousand, eight hundred eighty-one".