667340618788 has 6 divisors (see below), whose sum is σ = 1167846082886. Its totient is φ = 333670309392.

The previous prime is 667340618773. The next prime is 667340618839. The reversal of 667340618788 is 887816043766.

It can be written as a sum of positive squares in only one way, i.e., 392888268864 + 274452349924 = 626808^2 + 523882^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83417577345 + ... + 83417577352.

Almost surely, 2^667340618788 is an apocalyptic number.

It is an amenable number.

667340618788 is a deficient number, since it is larger than the sum of its proper divisors (500505464098).

667340618788 is a wasteful number, since it uses less digits than its factorization.

667340618788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166835154701 (or 166835154699 counting only the distinct ones).

The product of its (nonzero) digits is 65028096, while the sum is 64.

The spelling of 667340618788 in words is "six hundred sixty-seven billion, three hundred forty million, six hundred eighteen thousand, seven hundred eighty-eight".