666965041 has 2 divisors, whose sum is σ = 666965042. Its totient is φ = 666965040.

The previous prime is 666965003. The next prime is 666965053. The reversal of 666965041 is 140569666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507195441 + 159769600 = 22521^2 + 12640^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666965041 is a prime.

It is a super-2 number, since 2×666965041² = 889684731832263362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (666965141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333482520 + 333482521.

It is an arithmetic number, because the mean of its divisors is an integer number (333482521).

Almost surely, 2^666965041 is an apocalyptic number.

It is an amenable number.

666965041 is a deficient number, since it is larger than the sum of its proper divisors (1).

666965041 is an equidigital number, since it uses as much as digits as its factorization.

666965041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 666965041 is about 25825.6663224785. Note that the first 3 decimals coincide. The cubic root of 666965041 is about 873.7107722924.

The spelling of 666965041 in words is "six hundred sixty-six million, nine hundred sixty-five thousand, forty-one".