66347707 has 2 divisors, whose sum is σ = 66347708. Its totient is φ = 66347706.

The previous prime is 66347669. The next prime is 66347713. The reversal of 66347707 is 70774366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66347707 - 2¹¹ = 66345659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66347707.

It is not a weakly prime, because it can be changed into another prime (66347777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33173853 + 33173854.

It is an arithmetic number, because the mean of its divisors is an integer number (33173854).

Almost surely, 2^66347707 is an apocalyptic number.

66347707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66347707 is an equidigital number, since it uses as much as digits as its factorization.

66347707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 148176, while the sum is 40.

The square root of 66347707 is about 8145.4101799725. The cubic root of 66347707 is about 404.8324399572.

It can be divided in two parts, 6634 and 7707, that added together give a palindrome (14341).

The spelling of 66347707 in words is "sixty-six million, three hundred forty-seven thousand, seven hundred seven".