666666741 has 16 divisors (see below), whose sum is σ = 967139264. Its totient is φ = 406024704.

The previous prime is 666666727. The next prime is 666666757. The reversal of 666666741 is 147666666.

It is not a de Polignac number, because 666666741 - 2⁹ = 666666229 is a prime.

It is a super-2 number, since 2×666666741² = 888889087111122162, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666666241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84331 + ... + 91896.

It is an arithmetic number, because the mean of its divisors is an integer number (60446204).

Almost surely, 2^666666741 is an apocalyptic number.

It is an amenable number.

666666741 is a deficient number, since it is larger than the sum of its proper divisors (300472523).

666666741 is a wasteful number, since it uses less digits than its factorization.

666666741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176340.

The product of its digits is 1306368, while the sum is 48.

The square root of 666666741 is about 25819.8904141749. The cubic root of 666666741 is about 873.5804972044.

The spelling of 666666741 in words is "six hundred sixty-six million, six hundred sixty-six thousand, seven hundred forty-one".