66015799 has 2 divisors, whose sum is σ = 66015800. Its totient is φ = 66015798.

The previous prime is 66015787. The next prime is 66015821. The reversal of 66015799 is 99751066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66015799 - 2¹¹ = 66013751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66015739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33007899 + 33007900.

It is an arithmetic number, because the mean of its divisors is an integer number (33007900).

Almost surely, 2^66015799 is an apocalyptic number.

66015799 is a deficient number, since it is larger than the sum of its proper divisors (1).

66015799 is an equidigital number, since it uses as much as digits as its factorization.

66015799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 43.

The square root of 66015799 is about 8125.0107076853. The cubic root of 66015799 is about 404.1562457275.

The spelling of 66015799 in words is "sixty-six million, fifteen thousand, seven hundred ninety-nine".