666608943 has 64 divisors (see below), whose sum is σ = 1219018752. Its totient is φ = 312785280.

The previous prime is 666608941. The next prime is 666608951. The reversal of 666608943 is 349806666.

It is not a de Polignac number, because 666608943 - 2¹ = 666608941 is a prime.

666608943 is a modest number, since divided by 8943 gives 6666 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 666608892 and 666608901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666608941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 138780 + ... + 143502.

It is an arithmetic number, because the mean of its divisors is an integer number (19047168).

Almost surely, 2^666608943 is an apocalyptic number.

666608943 is a deficient number, since it is larger than the sum of its proper divisors (552409809).

666608943 is a wasteful number, since it uses less digits than its factorization.

666608943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4804.

The product of its (nonzero) digits is 1119744, while the sum is 48.

The square root of 666608943 is about 25818.7711365200. The cubic root of 666608943 is about 873.5552508748. Note that the first 3 decimals are identical.

The spelling of 666608943 in words is "six hundred sixty-six million, six hundred eight thousand, nine hundred forty-three".