667660066766 has 64 divisors (see below), whose sum is σ = 1319565219840. Its totient is φ = 245454300000.

The previous prime is 667660066757. The next prime is 667660066783.

It is a happy number.

667660066766 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 667660066699 and 667660066708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 279881 + ... + 1188971.

It is an arithmetic number, because the mean of its divisors is an integer number (20618206560).

Almost surely, 2^667660066766 is an apocalyptic number.

667660066766 is a deficient number, since it is larger than the sum of its proper divisors (651905153074).

667660066766 is a wasteful number, since it uses less digits than its factorization.

667660066766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909381.

The product of its (nonzero) digits is 82301184, while the sum is 62.

It can be divided in two parts, 6676600 and 66766, that multiplied together give a square (445769875600 = 667660²).

The spelling of 667660066766 in words is "six hundred sixty-seven billion, six hundred sixty million, sixty-six thousand, seven hundred sixty-six".