686191964917 has 8 divisors (see below), whose sum is σ = 687812254976. Its totient is φ = 684571839552.

The previous prime is 686191964891. The next prime is 686191964921. The reversal of 686191964917 is 719469191686.

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 686191964917 - 2⁷ = 686191964789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686191962917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13539298 + ... + 13589884.

It is an arithmetic number, because the mean of its divisors is an integer number (85976531872).

Almost surely, 2^686191964917 is an apocalyptic number.

It is an amenable number.

686191964917 is a deficient number, since it is larger than the sum of its proper divisors (1620290059).

686191964917 is a wasteful number, since it uses less digits than its factorization.

686191964917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82347.

The product of its digits is 35271936, while the sum is 67.

The spelling of 686191964917 in words is "six hundred eighty-six billion, one hundred ninety-one million, nine hundred sixty-four thousand, nine hundred seventeen".