667577775766 has 16 divisors (see below), whose sum is σ = 1092928055760. Its totient is φ = 303297760480.

The previous prime is 667577775677. The next prime is 667577775773.

667577775766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 667577775692 and 667577775701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7287601 + ... + 7378636.

It is an arithmetic number, because the mean of its divisors is an integer number (68308003485).

Almost surely, 2^667577775766 is an apocalyptic number.

667577775766 is a deficient number, since it is larger than the sum of its proper divisors (425350279994).

667577775766 is a wasteful number, since it uses less digits than its factorization.

667577775766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14668319.

The product of its digits is 3811827600, while the sum is 76.

The spelling of 667577775766 in words is "six hundred sixty-seven billion, five hundred seventy-seven million, seven hundred seventy-five thousand, seven hundred sixty-six".