667817279047 has 4 divisors (see below), whose sum is σ = 679136216040. Its totient is φ = 656498342056.

The previous prime is 667817279027. The next prime is 667817279057. The reversal of 667817279047 is 740972718766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667817279047 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667817279047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667817279027) 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 3 ways as a sum of consecutive naturals, for example, 5659468408 + ... + 5659468525.

It is an arithmetic number, because the mean of its divisors is an integer number (169784054010).

Almost surely, 2^667817279047 is an apocalyptic number.

667817279047 is a deficient number, since it is larger than the sum of its proper divisors (11318936993).

667817279047 is a wasteful number, since it uses less digits than its factorization.

667817279047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11318936992.

The product of its (nonzero) digits is 49787136, while the sum is 64.

The spelling of 667817279047 in words is "six hundred sixty-seven billion, eight hundred seventeen million, two hundred seventy-nine thousand, forty-seven".