667646688205 has 8 divisors (see below), whose sum is σ = 915629743872. Its totient is φ = 457814871888.

The previous prime is 667646688193. The next prime is 667646688221. The reversal of 667646688205 is 502886646766.

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 667646688205 - 2²⁵ = 667613133773 is a prime.

It is a super-2 number, since 2×667646688205² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9537809797 + ... + 9537809866.

It is an arithmetic number, because the mean of its divisors is an integer number (114453717984).

Almost surely, 2^667646688205 is an apocalyptic number.

It is an amenable number.

667646688205 is a deficient number, since it is larger than the sum of its proper divisors (247983055667).

667646688205 is a wasteful number, since it uses less digits than its factorization.

667646688205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19075619675.

The product of its (nonzero) digits is 139345920, while the sum is 64.

The spelling of 667646688205 in words is "six hundred sixty-seven billion, six hundred forty-six million, six hundred eighty-eight thousand, two hundred five".