667443161617 has 4 divisors (see below), whose sum is σ = 668452909876. Its totient is φ = 666433413360.

The previous prime is 667443161591. The next prime is 667443161621. The reversal of 667443161617 is 716161344766.

667443161617 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 399827317761 + 267615843856 = 632319^2 + 517316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667443161617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667443161647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504873138 + ... + 504874459.

It is an arithmetic number, because the mean of its divisors is an integer number (167113227469).

Almost surely, 2^667443161617 is an apocalyptic number.

It is an amenable number.

667443161617 is a deficient number, since it is larger than the sum of its proper divisors (1009748259).

667443161617 is a wasteful number, since it uses less digits than its factorization.

667443161617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009748258.

The product of its digits is 3048192, while the sum is 52.

The spelling of 667443161617 in words is "six hundred sixty-seven billion, four hundred forty-three million, one hundred sixty-one thousand, six hundred seventeen".