106666394 has 4 divisors (see below), whose sum is σ = 159999594. Its totient is φ = 53333196.

The previous prime is 106666393. The next prime is 106666397. The reversal of 106666394 is 493666601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 102718225 + 3948169 = 10135^2 + 1987^2 .

It is a super-2 number, since 2×106666394² = 22755439217926472, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (106666393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26666597 + ... + 26666600.

Almost surely, 2^106666394 is an apocalyptic number.

106666394 is a deficient number, since it is larger than the sum of its proper divisors (53333200).

106666394 is an equidigital number, since it uses as much as digits as its factorization.

106666394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53333199.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 106666394 is about 10327.9423894598. The cubic root of 106666394 is about 474.2520364957.

The spelling of 106666394 in words is "one hundred six million, six hundred sixty-six thousand, three hundred ninety-four".