667563365766 has 32 divisors (see below), whose sum is σ = 1461472927488. Its totient is φ = 201601507040.

The previous prime is 667563365731. The next prime is 667563365783.

667563365766 is nontrivially palindromic in base 10.

667563365766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 667563365697 and 667563365706.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17241066 + ... + 17279741.

It is an arithmetic number, because the mean of its divisors is an integer number (45671028984).

Almost surely, 2^667563365766 is an apocalyptic number.

667563365766 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

667563365766 is an abundant number, since it is smaller than the sum of its proper divisors (793909561722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667563365766 is a wasteful number, since it uses less digits than its factorization.

667563365766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34521116.

The product of its digits is 514382400, while the sum is 66.

The spelling of 667563365766 in words is "six hundred sixty-seven billion, five hundred sixty-three million, three hundred sixty-five thousand, seven hundred sixty-six".