106666289 has 4 divisors (see below), whose sum is σ = 106842624. Its totient is φ = 106489956.

The previous prime is 106666283. The next prime is 106666309. The reversal of 106666289 is 982666601.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982666601 = 7 ⋅140380943.

It is a cyclic number.

It is not a de Polignac number, because 106666289 - 2⁸ = 106666033 is a prime.

It is a super-2 number, since 2×106666289² = 22755394418063042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (106666283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87257 + ... + 88470.

It is an arithmetic number, because the mean of its divisors is an integer number (26710656).

Almost surely, 2^106666289 is an apocalyptic number.

It is an amenable number.

106666289 is a deficient number, since it is larger than the sum of its proper divisors (176335).

106666289 is an equidigital number, since it uses as much as digits as its factorization.

106666289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176334.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 106666289 is about 10327.9373061614. The cubic root of 106666289 is about 474.2518808813.

The spelling of 106666289 in words is "one hundred six million, six hundred sixty-six thousand, two hundred eighty-nine".