665886917273 has 8 divisors (see below), whose sum is σ = 688894869000. Its totient is φ = 642882054528.

The previous prime is 665886917257. The next prime is 665886917291. The reversal of 665886917273 is 372719688566.

It can be written as a sum of positive squares in 4 ways, for example, as 21265805584 + 644621111689 = 145828^2 + 802883^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 665886917273 - 2⁴ = 665886917257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665886919273) 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 7 ways as a sum of consecutive naturals, for example, 329348 + ... + 1200101.

It is an arithmetic number, because the mean of its divisors is an integer number (86111858625).

Almost surely, 2^665886917273 is an apocalyptic number.

It is an amenable number.

665886917273 is a deficient number, since it is larger than the sum of its proper divisors (23007951727).

665886917273 is a wasteful number, since it uses less digits than its factorization.

665886917273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544491.

The product of its digits is 182891520, while the sum is 68.

The spelling of 665886917273 in words is "six hundred sixty-five billion, eight hundred eighty-six million, nine hundred seventeen thousand, two hundred seventy-three".