686720016672 has 24 divisors (see below), whose sum is σ = 1802640044016. Its totient is φ = 228906672192.

The previous prime is 686720016637. The next prime is 686720016673. The reversal of 686720016672 is 276610027686.

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (686720016673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3576666658 + ... + 3576666849.

It is an arithmetic number, because the mean of its divisors is an integer number (75110001834).

Almost surely, 2^686720016672 is an apocalyptic number.

It is an amenable number.

686720016672 is an abundant number, since it is smaller than the sum of its proper divisors (1115920027344).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686720016672 is a wasteful number, since it uses less digits than its factorization.

686720016672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7153333520 (or 7153333512 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 51.

The spelling of 686720016672 in words is "six hundred eighty-six billion, seven hundred twenty million, sixteen thousand, six hundred seventy-two".