66667441 has 2 divisors, whose sum is σ = 66667442. Its totient is φ = 66667440.

The previous prime is 66667429. The next prime is 66667457. The reversal of 66667441 is 14476666.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50466816 + 16200625 = 7104^2 + 4025^2 .

It is a cyclic number.

It is not a de Polignac number, because 66667441 - 2¹³ = 66659249 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66667394 and 66667403.

It is not a weakly prime, because it can be changed into another prime (66667541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33333720 + 33333721.

It is an arithmetic number, because the mean of its divisors is an integer number (33333721).

Almost surely, 2^66667441 is an apocalyptic number.

It is an amenable number.

66667441 is a deficient number, since it is larger than the sum of its proper divisors (1).

66667441 is an equidigital number, since it uses as much as digits as its factorization.

66667441 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 66667441 is about 8165.0132271785. The cubic root of 66667441 is about 405.4817029161.

The spelling of 66667441 in words is "sixty-six million, six hundred sixty-seven thousand, four hundred forty-one".