667856007849 has 8 divisors (see below), whose sum is σ = 894363213760. Its totient is φ = 443293070256.

The previous prime is 667856007829. The next prime is 667856007869. The reversal of 667856007849 is 948700658766.

It is an interprime number because it is at equal distance from previous prime (667856007829) and next prime (667856007869).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667856007849 - 2⁹ = 667856007337 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 667856007849.

It is not an unprimeable number, because it can be changed into a prime (667856007829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 486066277 + ... + 486067650.

It is an arithmetic number, because the mean of its divisors is an integer number (111795401720).

Almost surely, 2^667856007849 is an apocalyptic number.

It is an amenable number.

667856007849 is a deficient number, since it is larger than the sum of its proper divisors (226507205911).

667856007849 is a wasteful number, since it uses less digits than its factorization.

667856007849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972134159.

The product of its (nonzero) digits is 121927680, while the sum is 66.

The spelling of 667856007849 in words is "six hundred sixty-seven billion, eight hundred fifty-six million, seven thousand, eight hundred forty-nine".