686354719971 has 8 divisors (see below), whose sum is σ = 915833445120. Its totient is φ = 457222904072.

The previous prime is 686354719961. The next prime is 686354719991. The reversal of 686354719971 is 179917453686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686354719971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (686354719961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86722695 + ... + 86730608.

It is an arithmetic number, because the mean of its divisors is an integer number (114479180640).

Almost surely, 2^686354719971 is an apocalyptic number.

686354719971 is a deficient number, since it is larger than the sum of its proper divisors (229478725149).

686354719971 is a wasteful number, since it uses less digits than its factorization.

686354719971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173454625.

The product of its digits is 68584320, while the sum is 66.

The spelling of 686354719971 in words is "six hundred eighty-six billion, three hundred fifty-four million, seven hundred nineteen thousand, nine hundred seventy-one".