667445374685 has 4 divisors (see below), whose sum is σ = 800934449628. Its totient is φ = 533956299744.

The previous prime is 667445374679. The next prime is 667445374711. The reversal of 667445374685 is 586473544766.

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

It can be written as a sum of positive squares in 2 ways, for example, as 76433449156 + 591011925529 = 276466^2 + 768773^2 .

It is a cyclic number.

It is not a de Polignac number, because 667445374685 - 2¹² = 667445370589 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 66744537464 + ... + 66744537473.

It is an arithmetic number, because the mean of its divisors is an integer number (200233612407).

Almost surely, 2^667445374685 is an apocalyptic number.

It is an amenable number.

667445374685 is a deficient number, since it is larger than the sum of its proper divisors (133489074943).

667445374685 is a wasteful number, since it uses less digits than its factorization.

667445374685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133489074942.

The product of its digits is 406425600, while the sum is 65.

The spelling of 667445374685 in words is "six hundred sixty-seven billion, four hundred forty-five million, three hundred seventy-four thousand, six hundred eighty-five".