667567765766 has 48 divisors (see below), whose sum is σ = 1139280690240. Its totient is φ = 290789859360.

The previous prime is 667567765727. The next prime is 667567765769.

667567765766 is nontrivially palindromic in base 10.

667567765766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 667567765693 and 667567765702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667567765769) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2531705 + ... + 2782923.

It is an arithmetic number, because the mean of its divisors is an integer number (23735014380).

Almost surely, 2^667567765766 is an apocalyptic number.

667567765766 is a deficient number, since it is larger than the sum of its proper divisors (471712924474).

667567765766 is a wasteful number, since it uses less digits than its factorization.

667567765766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251381 (or 251328 counting only the distinct ones).

The product of its digits is 2800526400, while the sum is 74.

The spelling of 667567765766 in words is "six hundred sixty-seven billion, five hundred sixty-seven million, seven hundred sixty-five thousand, seven hundred sixty-six".