106406666 has 4 divisors (see below), whose sum is σ = 159610002. Its totient is φ = 53203332.

The previous prime is 106406659. The next prime is 106406683. The reversal of 106406666 is 666604601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666604601 = 13 ⋅51277277.

It can be written as a sum of positive squares in only one way, i.e., 97436641 + 8970025 = 9871^2 + 2995^2 .

It is a super-2 number, since 2×106406666² = 22644757138471112, 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, 26601665 + ... + 26601668.

Almost surely, 2^106406666 is an apocalyptic number.

106406666 is a deficient number, since it is larger than the sum of its proper divisors (53203336).

106406666 is an equidigital number, since it uses as much as digits as its factorization.

106406666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53203335.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 106406666 is about 10315.3606820120. The cubic root of 106406666 is about 473.8667959957.

The spelling of 106406666 in words is "one hundred six million, four hundred six thousand, six hundred sixty-six".