667516841 has 2 divisors, whose sum is σ = 667516842. Its totient is φ = 667516840.

The previous prime is 667516813. The next prime is 667516897. The reversal of 667516841 is 148615766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 610287616 + 57229225 = 24704^2 + 7565^2 .

It is a cyclic number.

It is not a de Polignac number, because 667516841 - 2¹⁰ = 667515817 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 667516792 and 667516801.

It is not a weakly prime, because it can be changed into another prime (667510841) 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, 333758420 + 333758421.

It is an arithmetic number, because the mean of its divisors is an integer number (333758421).

Almost surely, 2^667516841 is an apocalyptic number.

It is an amenable number.

667516841 is a deficient number, since it is larger than the sum of its proper divisors (1).

667516841 is an equidigital number, since it uses as much as digits as its factorization.

667516841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 241920, while the sum is 44.

The square root of 667516841 is about 25836.3472843976. The cubic root of 667516841 is about 873.9516548374.

The spelling of 667516841 in words is "six hundred sixty-seven million, five hundred sixteen thousand, eight hundred forty-one".