66707220107567 has 12 divisors (see below), whose sum is σ = 72233645361480. Its totient is φ = 61575568692768.

The previous prime is 66707220107543. The next prime is 66707220107573. The reversal of 66707220107567 is 76570102270766.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-66707220107567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707220100567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34436909 + ... + 36322377.

It is an arithmetic number, because the mean of its divisors is an integer number (6019470446790).

Almost surely, 2^{66707220107567} is an apocalyptic number.

66707220107567 is a deficient number, since it is larger than the sum of its proper divisors (5526425253913).

66707220107567 is a wasteful number, since it uses less digits than its factorization.

66707220107567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094842 (or 2094829 counting only the distinct ones).

The product of its (nonzero) digits is 10372320, while the sum is 56.

The spelling of 66707220107567 in words is "sixty-six trillion, seven hundred seven billion, two hundred twenty million, one hundred seven thousand, five hundred sixty-seven".