667074726361 has 4 divisors (see below), whose sum is σ = 673679426724. Its totient is φ = 660470026000.

The previous prime is 667074726349. The next prime is 667074726431. The reversal of 667074726361 is 163627470766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 163627470766 = 2 ⋅81813735383.

It can be written as a sum of positive squares in 2 ways, for example, as 421609969225 + 245464757136 = 649315^2 + 495444^2 .

It is a cyclic number.

It is not a de Polignac number, because 667074726361 - 2¹⁷ = 667074595289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667074723361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3302350030 + ... + 3302350231.

It is an arithmetic number, because the mean of its divisors is an integer number (168419856681).

Almost surely, 2^667074726361 is an apocalyptic number.

It is an amenable number.

667074726361 is a deficient number, since it is larger than the sum of its proper divisors (6604700363).

667074726361 is a wasteful number, since it uses less digits than its factorization.

667074726361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6604700362.

The product of its (nonzero) digits is 10668672, while the sum is 55.

The spelling of 667074726361 in words is "six hundred sixty-seven billion, seventy-four million, seven hundred twenty-six thousand, three hundred sixty-one".