667648723173 has 16 divisors (see below), whose sum is σ = 898589952000. Its totient is φ = 440919745200.

The previous prime is 667648723171. The next prime is 667648723207. The reversal of 667648723173 is 371327846766.

It is not a de Polignac number, because 667648723173 - 2¹ = 667648723171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667648723171) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1890073 + ... + 2215326.

It is an arithmetic number, because the mean of its divisors is an integer number (56161872000).

Almost surely, 2^667648723173 is an apocalyptic number.

It is an amenable number.

667648723173 is a deficient number, since it is larger than the sum of its proper divisors (230941228827).

667648723173 is a wasteful number, since it uses less digits than its factorization.

667648723173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105912.

The product of its digits is 42674688, while the sum is 60.

The spelling of 667648723173 in words is "six hundred sixty-seven billion, six hundred forty-eight million, seven hundred twenty-three thousand, one hundred seventy-three".