66515063 has 2 divisors, whose sum is σ = 66515064. Its totient is φ = 66515062.

The previous prime is 66515051. The next prime is 66515083. The reversal of 66515063 is 36051566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66515063 - 2⁸ = 66514807 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66515083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33257531 + 33257532.

It is an arithmetic number, because the mean of its divisors is an integer number (33257532).

Almost surely, 2^66515063 is an apocalyptic number.

66515063 is a deficient number, since it is larger than the sum of its proper divisors (1).

66515063 is an equidigital number, since it uses as much as digits as its factorization.

66515063 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 66515063 is about 8155.6767346432. The cubic root of 66515063 is about 405.1725383832.

The spelling of 66515063 in words is "sixty-six million, five hundred fifteen thousand, sixty-three".