666704040041 has 4 divisors (see below), whose sum is σ = 717988966212. Its totient is φ = 615419113872.

The previous prime is 666704040017. The next prime is 666704040043. The reversal of 666704040041 is 140040407666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 140040407666 = 2 ⋅70020203833.

It can be written as a sum of positive squares in 2 ways, for example, as 41503875625 + 625200164416 = 203725^2 + 790696^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666704040041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666704039977 and 666704040004.

It is not an unprimeable number, because it can be changed into a prime (666704040043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25642463066 + ... + 25642463091.

It is an arithmetic number, because the mean of its divisors is an integer number (179497241553).

Almost surely, 2^666704040041 is an apocalyptic number.

It is an amenable number.

666704040041 is a deficient number, since it is larger than the sum of its proper divisors (51284926171).

666704040041 is a wasteful number, since it uses less digits than its factorization.

666704040041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51284926170.

The product of its (nonzero) digits is 96768, while the sum is 38.

The spelling of 666704040041 in words is "six hundred sixty-six billion, seven hundred four million, forty thousand, forty-one".