66345607 has 2 divisors, whose sum is σ = 66345608. Its totient is φ = 66345606.

The previous prime is 66345599. The next prime is 66345637. The reversal of 66345607 is 70654366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66345607 - 2³ = 66345599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66345637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33172803 + 33172804.

It is an arithmetic number, because the mean of its divisors is an integer number (33172804).

Almost surely, 2^66345607 is an apocalyptic number.

66345607 is a deficient number, since it is larger than the sum of its proper divisors (1).

66345607 is an equidigital number, since it uses as much as digits as its factorization.

66345607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 37.

The square root of 66345607 is about 8145.2812720004. The cubic root of 66345607 is about 404.8281687365.

The spelling of 66345607 in words is "sixty-six million, three hundred forty-five thousand, six hundred seven".