667688517136 has 20 divisors (see below), whose sum is σ = 1294213712764. Its totient is φ = 333697881600.

The previous prime is 667688517131. The next prime is 667688517137. The reversal of 667688517136 is 631715886766.

667688517136 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 437714560000 + 229973957136 = 661600^2 + 479556^2 .

It is not an unprimeable number, because it can be changed into a prime (667688517131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9110925 + ... + 9183916.

Almost surely, 2^667688517136 is an apocalyptic number.

It is an amenable number.

667688517136 is a deficient number, since it is larger than the sum of its proper divisors (626525195628).

667688517136 is a wasteful number, since it uses less digits than its factorization.

667688517136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18297130 (or 18297124 counting only the distinct ones).

The product of its digits is 60963840, while the sum is 64.

The spelling of 667688517136 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, five hundred seventeen thousand, one hundred thirty-six".