66745607 has 2 divisors, whose sum is σ = 66745608. Its totient is φ = 66745606.

The previous prime is 66745571. The next prime is 66745631. The reversal of 66745607 is 70654766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66745607 - 2¹² = 66741511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66745667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33372803 + 33372804.

It is an arithmetic number, because the mean of its divisors is an integer number (33372804).

Almost surely, 2^66745607 is an apocalyptic number.

66745607 is a deficient number, since it is larger than the sum of its proper divisors (1).

66745607 is an equidigital number, since it uses as much as digits as its factorization.

66745607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 41.

The square root of 66745607 is about 8169.7984675266. The cubic root of 66745607 is about 405.6401135946.

The spelling of 66745607 in words is "sixty-six million, seven hundred forty-five thousand, six hundred seven".