66895841 has 2 divisors, whose sum is σ = 66895842. Its totient is φ = 66895840.

The previous prime is 66895819. The next prime is 66895859. The reversal of 66895841 is 14859866.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65674816 + 1221025 = 8104^2 + 1105^2 .

It is a cyclic number.

It is not a de Polignac number, because 66895841 - 2²² = 62701537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66895811) 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, 33447920 + 33447921.

It is an arithmetic number, because the mean of its divisors is an integer number (33447921).

Almost surely, 2^66895841 is an apocalyptic number.

It is an amenable number.

66895841 is a deficient number, since it is larger than the sum of its proper divisors (1).

66895841 is an equidigital number, since it uses as much as digits as its factorization.

66895841 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 47.

The square root of 66895841 is about 8178.9877735573. The cubic root of 66895841 is about 405.9442298442.

The spelling of 66895841 in words is "sixty-six million, eight hundred ninety-five thousand, eight hundred forty-one".