2018108681 has 2 divisors, whose sum is σ = 2018108682. Its totient is φ = 2018108680.

The previous prime is 2018108669. The next prime is 2018108783. The reversal of 2018108681 is 1868018102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2013765625 + 4343056 = 44875^2 + 2084^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2018108681 is a prime.

It is a super-2 number, since 2×2018108681² = 8145525296655119522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2018108611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1009054340 + 1009054341.

It is an arithmetic number, because the mean of its divisors is an integer number (1009054341).

Almost surely, 2^2018108681 is an apocalyptic number.

It is an amenable number.

2018108681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2018108681 is an equidigital number, since it uses as much as digits as its factorization.

2018108681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6144, while the sum is 35.

The square root of 2018108681 is about 44923.3645333918. The cubic root of 2018108681 is about 1263.7122153756.

The spelling of 2018108681 in words is "two billion, eighteen million, one hundred eight thousand, six hundred eighty-one".