666051005 has 4 divisors (see below), whose sum is σ = 799261212. Its totient is φ = 532840800.

The previous prime is 666050993. The next prime is 666051017. The reversal of 666051005 is 500150666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500150666 = 2 ⋅250075333.

It is an interprime number because it is at equal distance from previous prime (666050993) and next prime (666051017).

It can be written as a sum of positive squares in 2 ways, for example, as 83649316 + 582401689 = 9146^2 + 24133^2 .

It is not a de Polignac number, because 666051005 - 2⁴ = 666050989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 66605096 + ... + 66605105.

It is an arithmetic number, because the mean of its divisors is an integer number (199815303).

Almost surely, 2^666051005 is an apocalyptic number.

It is an amenable number.

666051005 is a deficient number, since it is larger than the sum of its proper divisors (133210207).

666051005 is a wasteful number, since it uses less digits than its factorization.

666051005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133210206.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 666051005 is about 25807.9639840108. The cubic root of 666051005 is about 873.3114669110.

The spelling of 666051005 in words is "six hundred sixty-six million, fifty-one thousand, five".