686397829851 has 6 divisors (see below), whose sum is σ = 991463532020. Its totient is φ = 457598553228.

The previous prime is 686397829813. The next prime is 686397829883. The reversal of 686397829851 is 158928793686.

686397829851 is a `hidden beast` number, since 6 + 86 + 397 + 82 + 9 + 85 + 1 = 666.

It is not a de Polignac number, because 686397829851 - 2¹⁴ = 686397813467 is a prime.

It is a super-2 number, since 2×686397829851² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 686397829851.

It is not an unprimeable number, because it can be changed into a prime (686397824851) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 38133212761 + ... + 38133212778.

Almost surely, 2^686397829851 is an apocalyptic number.

686397829851 is a deficient number, since it is larger than the sum of its proper divisors (305065702169).

686397829851 is a wasteful number, since it uses less digits than its factorization.

686397829851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76266425545 (or 76266425542 counting only the distinct ones).

The product of its digits is 313528320, while the sum is 72.

The spelling of 686397829851 in words is "six hundred eighty-six billion, three hundred ninety-seven million, eight hundred twenty-nine thousand, eight hundred fifty-one".