66345599 has 2 divisors, whose sum is σ = 66345600. Its totient is φ = 66345598.

The previous prime is 66345589. The next prime is 66345607. The reversal of 66345599 is 99554366.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66345599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66345589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33172799 + 33172800.

It is an arithmetic number, because the mean of its divisors is an integer number (33172800).

Almost surely, 2^66345599 is an apocalyptic number.

66345599 is a deficient number, since it is larger than the sum of its proper divisors (1).

66345599 is an equidigital number, since it uses as much as digits as its factorization.

66345599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 874800, while the sum is 47.

The square root of 66345599 is about 8145.2807809185. The cubic root of 66345599 is about 404.8281524650.

The spelling of 66345599 in words is "sixty-six million, three hundred forty-five thousand, five hundred ninety-nine".