108186478681 has 2 divisors, whose sum is σ = 108186478682. Its totient is φ = 108186478680.

The previous prime is 108186478657. The next prime is 108186478693. The reversal of 108186478681 is 186874681801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104270222281 + 3916256400 = 322909^2 + 62580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108186478681 is a prime.

It is a super-2 number, since 2×108186478681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (108186478651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54093239340 + 54093239341.

It is an arithmetic number, because the mean of its divisors is an integer number (54093239341).

Almost surely, 2^108186478681 is an apocalyptic number.

It is an amenable number.

108186478681 is a deficient number, since it is larger than the sum of its proper divisors (1).

108186478681 is an equidigital number, since it uses as much as digits as its factorization.

108186478681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4128768, while the sum is 58.

The spelling of 108186478681 in words is "one hundred eight billion, one hundred eighty-six million, four hundred seventy-eight thousand, six hundred eighty-one".