666610471 has 2 divisors, whose sum is σ = 666610472. Its totient is φ = 666610470.

The previous prime is 666610429. The next prime is 666610487. The reversal of 666610471 is 174016666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666610471 - 2²⁷ = 532392743 is a prime.

It is a super-3 number, since 3×666610471³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666610471.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666610411) 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 as a sum of consecutive naturals, namely, 333305235 + 333305236.

It is an arithmetic number, because the mean of its divisors is an integer number (333305236).

Almost surely, 2^666610471 is an apocalyptic number.

666610471 is a deficient number, since it is larger than the sum of its proper divisors (1).

666610471 is an equidigital number, since it uses as much as digits as its factorization.

666610471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 666610471 is about 25818.8007273769. The cubic root of 666610471 is about 873.5559183283. Note that the first 3 decimals are identical.

The spelling of 666610471 in words is "six hundred sixty-six million, six hundred ten thousand, four hundred seventy-one".