667634842865 has 8 divisors (see below), whose sum is σ = 804279174120. Its totient is φ = 532029632512.

The previous prime is 667634842859. The next prime is 667634842873. The reversal of 667634842865 is 568248436766.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 432527198224 + 235107644641 = 657668^2 + 484879^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 667634842865 - 2¹⁸ = 667634580721 is a prime.

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, 259778810 + ... + 259781379.

It is an arithmetic number, because the mean of its divisors is an integer number (100534896765).

Almost surely, 2^667634842865 is an apocalyptic number.

It is an amenable number.

667634842865 is a deficient number, since it is larger than the sum of its proper divisors (136644331255).

667634842865 is a wasteful number, since it uses less digits than its factorization.

667634842865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 519560451.

The product of its digits is 278691840, while the sum is 65.

The spelling of 667634842865 in words is "six hundred sixty-seven billion, six hundred thirty-four million, eight hundred forty-two thousand, eight hundred sixty-five".