66515041 has 2 divisors, whose sum is σ = 66515042. Its totient is φ = 66515040.

The previous prime is 66515039. The next prime is 66515051. The reversal of 66515041 is 14051566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54982225 + 11532816 = 7415^2 + 3396^2 .

It is a cyclic number.

It is not a de Polignac number, because 66515041 - 2¹ = 66515039 is a prime.

Together with 66515039, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66515021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257520 + 33257521.

It is an arithmetic number, because the mean of its divisors is an integer number (33257521).

Almost surely, 2^66515041 is an apocalyptic number.

It is an amenable number.

66515041 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515041 is an equidigital number, since it uses as much as digits as its factorization.

66515041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 66515041 is about 8155.6753858893. The cubic root of 66515041 is about 405.1724937127.

The spelling of 66515041 in words is "sixty-six million, five hundred fifteen thousand, forty-one".