66813707 has 2 divisors, whose sum is σ = 66813708. Its totient is φ = 66813706.

The previous prime is 66813679. The next prime is 66813737. The reversal of 66813707 is 70731866.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66813707 is a prime.

It is not a weakly prime, because it can be changed into another prime (66813737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33406853 + 33406854.

It is an arithmetic number, because the mean of its divisors is an integer number (33406854).

Almost surely, 2^66813707 is an apocalyptic number.

66813707 is a deficient number, since it is larger than the sum of its proper divisors (1).

66813707 is an equidigital number, since it uses as much as digits as its factorization.

66813707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66813707 is about 8173.9651944451. The cubic root of 66813707 is about 405.7780238053.

The spelling of 66813707 in words is "sixty-six million, eight hundred thirteen thousand, seven hundred seven".