686722170005 has 8 divisors (see below), whose sum is σ = 872541110232. Its totient is φ = 517061398528.

The previous prime is 686722169977. The next prime is 686722170037. The reversal of 686722170005 is 500071227686.

It can be written as a sum of positive squares in 4 ways, for example, as 81316795921 + 605405374084 = 285161^2 + 778078^2 .

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

It is not a de Polignac number, because 686722170005 - 2⁶ = 686722169941 is a prime.

It is a super-2 number, since 2×686722170005² (a number of 24 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 4039542092 + ... + 4039542261.

It is an arithmetic number, because the mean of its divisors is an integer number (109067638779).

Almost surely, 2^686722170005 is an apocalyptic number.

It is an amenable number.

686722170005 is a deficient number, since it is larger than the sum of its proper divisors (185818940227).

686722170005 is a wasteful number, since it uses less digits than its factorization.

686722170005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8079084375.

The product of its (nonzero) digits is 282240, while the sum is 44.

The spelling of 686722170005 in words is "six hundred eighty-six billion, seven hundred twenty-two million, one hundred seventy thousand, five".