681166111 has 2 divisors, whose sum is σ = 681166112. Its totient is φ = 681166110.

The previous prime is 681166051. The next prime is 681166133. The reversal of 681166111 is 111661186.

681166111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 681166111 - 2²³ = 672777503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (681166141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340583055 + 340583056.

It is an arithmetic number, because the mean of its divisors is an integer number (340583056).

Almost surely, 2^681166111 is an apocalyptic number.

681166111 is a deficient number, since it is larger than the sum of its proper divisors (1).

681166111 is an equidigital number, since it uses as much as digits as its factorization.

681166111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 31.

The square root of 681166111 is about 26099.1592010164. The cubic root of 681166111 is about 879.8683131977.

The spelling of 681166111 in words is "six hundred eighty-one million, one hundred sixty-six thousand, one hundred eleven".