667766516545111 has 4 divisors (see below), whose sum is σ = 707046899871312. Its totient is φ = 628486133218912.

The previous prime is 667766516545091. The next prime is 667766516545127. The reversal of 667766516545111 is 111545615667766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 667766516545111 - 2³³ = 667757926610519 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667766516545811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19640191663075 + ... + 19640191663108.

It is an arithmetic number, because the mean of its divisors is an integer number (176761724967828).

Almost surely, 2^{667766516545111} is an apocalyptic number.

667766516545111 is a deficient number, since it is larger than the sum of its proper divisors (39280383326201).

667766516545111 is a wasteful number, since it uses less digits than its factorization.

667766516545111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39280383326200.

The product of its digits is 190512000, while the sum is 67.

The spelling of 667766516545111 in words is "six hundred sixty-seven trillion, seven hundred sixty-six billion, five hundred sixteen million, five hundred forty-five thousand, one hundred eleven".