667688841677 has 32 divisors (see below), whose sum is σ = 825948385920. Its totient is φ = 530651070720.

The previous prime is 667688841671. The next prime is 667688841761. The reversal of 667688841677 is 776148886766.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667688841677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667688841671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9564383 + ... + 9633939.

It is an arithmetic number, because the mean of its divisors is an integer number (25810887060).

Almost surely, 2^667688841677 is an apocalyptic number.

It is an amenable number.

667688841677 is a deficient number, since it is larger than the sum of its proper divisors (158259544243).

667688841677 is a wasteful number, since it uses less digits than its factorization.

667688841677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73133.

The product of its digits is 910393344, while the sum is 74.

The spelling of 667688841677 in words is "six hundred sixty-seven billion, six hundred eighty-eight million, eight hundred forty-one thousand, six hundred seventy-seven".