667706872345 has 16 divisors (see below), whose sum is σ = 827450075088. Its totient is φ = 516857137920.

The previous prime is 667706872333. The next prime is 667706872369. The reversal of 667706872345 is 543278607766.

It can be written as a sum of positive squares in 8 ways, for example, as 85142571264 + 582564301081 = 291792^2 + 763259^2 .

It is not a de Polignac number, because 667706872345 - 2¹¹ = 667706870297 is a prime.

It is a Duffinian 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, 9936754 + ... + 10003723.

It is an arithmetic number, because the mean of its divisors is an integer number (51715629693).

Almost surely, 2^667706872345 is an apocalyptic number.

It is an amenable number.

667706872345 is a deficient number, since it is larger than the sum of its proper divisors (159743202743).

667706872345 is a wasteful number, since it uses less digits than its factorization.

667706872345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19940700.

The product of its (nonzero) digits is 71124480, while the sum is 61.

The spelling of 667706872345 in words is "six hundred sixty-seven billion, seven hundred six million, eight hundred seventy-two thousand, three hundred forty-five".