105623666 has 4 divisors (see below), whose sum is σ = 158435502. Its totient is φ = 52811832.

The previous prime is 105623633. The next prime is 105623723. The reversal of 105623666 is 666326501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666326501 = 331 ⋅2013071.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 3916441 = 10085^2 + 1979^2 .

It is a super-2 number, since 2×105623666² = 22312717638559112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26405915 + ... + 26405918.

Almost surely, 2^105623666 is an apocalyptic number.

105623666 is a deficient number, since it is larger than the sum of its proper divisors (52811836).

105623666 is an equidigital number, since it uses as much as digits as its factorization.

105623666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52811835.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 105623666 is about 10277.3374956746. The cubic root of 105623666 is about 472.7016072739.

The spelling of 105623666 in words is "one hundred five million, six hundred twenty-three thousand, six hundred sixty-six".