666950959 has 4 divisors (see below), whose sum is σ = 674444880. Its totient is φ = 659457040.

The previous prime is 666950929. The next prime is 666950981. The reversal of 666950959 is 959059666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 959059666 = 2 ⋅479529833.

It is a cyclic number.

It is not a de Polignac number, because 666950959 - 2²³ = 658562351 is a prime.

It is a super-2 number, since 2×666950959² = 889647163422039362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666950929) 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 in 3 ways as a sum of consecutive naturals, for example, 3746827 + ... + 3747004.

It is an arithmetic number, because the mean of its divisors is an integer number (168611220).

Almost surely, 2^666950959 is an apocalyptic number.

666950959 is a deficient number, since it is larger than the sum of its proper divisors (7493921).

666950959 is an equidigital number, since it uses as much as digits as its factorization.

666950959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493920.

The product of its (nonzero) digits is 3936600, while the sum is 55.

The square root of 666950959 is about 25825.3936852858. The cubic root of 666950959 is about 873.7046232037.

The spelling of 666950959 in words is "six hundred sixty-six million, nine hundred fifty thousand, nine hundred fifty-nine".