66504041 has 2 divisors, whose sum is σ = 66504042. Its totient is φ = 66504040.

The previous prime is 66504023. The next prime is 66504043. The reversal of 66504041 is 14040566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66504025 + 16 = 8155^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 66504041 - 2⁶ = 66503977 is a prime.

Together with 66504043, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66504041.

It is not a weakly prime, because it can be changed into another prime (66504043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33252020 + 33252021.

It is an arithmetic number, because the mean of its divisors is an integer number (33252021).

Almost surely, 2^66504041 is an apocalyptic number.

It is an amenable number.

66504041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66504041 is an equidigital number, since it uses as much as digits as its factorization.

66504041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 66504041 is about 8155.0009809932. Note that the first 3 decimals coincide. The cubic root of 66504041 is about 405.1501571951.

The spelling of 66504041 in words is "sixty-six million, five hundred four thousand, forty-one".