667651636677 has 8 divisors (see below), whose sum is σ = 893586982464. Its totient is φ = 443408691008.

The previous prime is 667651636651. The next prime is 667651636697. The reversal of 667651636677 is 776636156766.

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 667651636677 - 2⁷ = 667651636549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667651636697) 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 7 ways as a sum of consecutive naturals, for example, 423099108 + ... + 423100685.

It is an arithmetic number, because the mean of its divisors is an integer number (111698372808).

Almost surely, 2^667651636677 is an apocalyptic number.

It is an amenable number.

667651636677 is a deficient number, since it is larger than the sum of its proper divisors (225935345787).

667651636677 is a wasteful number, since it uses less digits than its factorization.

667651636677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846200059.

The product of its digits is 240045120, while the sum is 66.

The spelling of 667651636677 in words is "six hundred sixty-seven billion, six hundred fifty-one million, six hundred thirty-six thousand, six hundred seventy-seven".