666660041 has 4 divisors (see below), whose sum is σ = 682920084. Its totient is φ = 650400000.

The previous prime is 666660019. The next prime is 666660047. The reversal of 666660041 is 140066666.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65674816 + 600985225 = 8104^2 + 24515^2 .

It is a cyclic number.

It is not a de Polignac number, because 666660041 - 2²⁶ = 599551177 is a prime.

It is a super-2 number, since 2×666660041² = 888871220532243362, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666659983 and 666660010.

It is not an unprimeable number, because it can be changed into a prime (666660047) by changing a digit.

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, 8129960 + ... + 8130041.

It is an arithmetic number, because the mean of its divisors is an integer number (170730021).

Almost surely, 2^666660041 is an apocalyptic number.

It is an amenable number.

666660041 is a deficient number, since it is larger than the sum of its proper divisors (16260043).

666660041 is a wasteful number, since it uses less digits than its factorization.

666660041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16260042.

The product of its (nonzero) digits is 31104, while the sum is 35.

The square root of 666660041 is about 25819.7606689140. The cubic root of 666660041 is about 873.5775707002.

The spelling of 666660041 in words is "six hundred sixty-six million, six hundred sixty thousand, forty-one".