666929943 has 10 divisors (see below), whose sum is σ = 996278184. Its totient is φ = 444619908.

The previous prime is 666929933. The next prime is 666929987. The reversal of 666929943 is 349929666.

It is not a de Polignac number, because 666929943 - 2⁵ = 666929911 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666929943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666929933) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4116771 + ... + 4116932.

Almost surely, 2^666929943 is an apocalyptic number.

666929943 is a deficient number, since it is larger than the sum of its proper divisors (329348241).

666929943 is an equidigital number, since it uses as much as digits as its factorization.

666929943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8233715 (or 8233706 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 666929943 is about 25824.9867957372. The cubic root of 666929943 is about 873.6954461325.

The spelling of 666929943 in words is "six hundred sixty-six million, nine hundred twenty-nine thousand, nine hundred forty-three".