667746427776205 has 4 divisors (see below), whose sum is σ = 801295713331452. Its totient is φ = 534197142220960.

The previous prime is 667746427776187. The next prime is 667746427776293. The reversal of 667746427776205 is 502677724647766.

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 481971354191716 + 185775073584489 = 21953846^2 + 13629933^2 .

It is not a de Polignac number, because 667746427776205 - 2³⁵ = 667712068037837 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 66774642777616 + ... + 66774642777625.

It is an arithmetic number, because the mean of its divisors is an integer number (200323928332863).

Almost surely, 2^{667746427776205} is an apocalyptic number.

It is an amenable number.

667746427776205 is a deficient number, since it is larger than the sum of its proper divisors (133549285555247).

667746427776205 is a wasteful number, since it uses less digits than its factorization.

667746427776205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133549285555246.

The product of its (nonzero) digits is 6970199040, while the sum is 76.

The spelling of 667746427776205 in words is "six hundred sixty-seven trillion, seven hundred forty-six billion, four hundred twenty-seven million, seven hundred seventy-six thousand, two hundred five".