111666613 has 2 divisors, whose sum is σ = 111666614. Its totient is φ = 111666612.

The previous prime is 111666593. The next prime is 111666631. The reversal of 111666613 is 316666111.

Together with next prime (111666631) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74615044 + 37051569 = 8638^2 + 6087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111666613 is a prime.

It is equal to p_6393037 and since 111666613 and 6393037 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111663613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55833306 + 55833307.

It is an arithmetic number, because the mean of its divisors is an integer number (55833307).

Almost surely, 2^111666613 is an apocalyptic number.

It is an amenable number.

111666613 is a deficient number, since it is larger than the sum of its proper divisors (1).

111666613 is an equidigital number, since it uses as much as digits as its factorization.

111666613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 111666613 is about 10567.2424501381. The cubic root of 111666613 is about 481.5496976675.

The spelling of 111666613 in words is "one hundred eleven million, six hundred sixty-six thousand, six hundred thirteen".