686872240217 has 16 divisors (see below), whose sum is σ = 706617250560. Its totient is φ = 667382906112.

The previous prime is 686872240211. The next prime is 686872240231. The reversal of 686872240217 is 712042278686.

It is not a de Polignac number, because 686872240217 - 2¹² = 686872236121 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686872240211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17668433 + ... + 17707265.

It is an arithmetic number, because the mean of its divisors is an integer number (44163578160).

Almost surely, 2^686872240217 is an apocalyptic number.

It is an amenable number.

686872240217 is a deficient number, since it is larger than the sum of its proper divisors (19745010343).

686872240217 is a wasteful number, since it uses less digits than its factorization.

686872240217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42112.

The product of its (nonzero) digits is 3612672, while the sum is 53.

The spelling of 686872240217 in words is "six hundred eighty-six billion, eight hundred seventy-two million, two hundred forty thousand, two hundred seventeen".