666771106 has 4 divisors (see below), whose sum is σ = 1000156662. Its totient is φ = 333385552.

The previous prime is 666771089. The next prime is 666771109. The reversal of 666771106 is 601177666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 601177666 = 2 ⋅300588833.

It can be written as a sum of positive squares in only one way, i.e., 623750625 + 43020481 = 24975^2 + 6559^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666771109) 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, 166692775 + ... + 166692778.

Almost surely, 2^666771106 is an apocalyptic number.

666771106 is a deficient number, since it is larger than the sum of its proper divisors (333385556).

666771106 is a wasteful number, since it uses less digits than its factorization.

666771106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333385555.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 666771106 is about 25821.9113545067. The cubic root of 666771106 is about 873.6260804350.

The spelling of 666771106 in words is "six hundred sixty-six million, seven hundred seventy-one thousand, one hundred six".