686800126629 has 20 divisors (see below), whose sum is σ = 1025996257836. Its totient is φ = 457850874816.

The previous prime is 686800126601. The next prime is 686800126657. The reversal of 686800126629 is 926621008686.

It is a happy number.

686800126629 is a `hidden beast` number, since 6 + 8 + 6 + 8 + 0 + 0 + 1 + 2 + 6 + 629 = 666.

It is an interprime number because it is at equal distance from previous prime (686800126601) and next prime (686800126657).

It can be written as a sum of positive squares in 2 ways, for example, as 501650642529 + 185149484100 = 708273^2 + 430290^2 .

It is not a de Polignac number, because 686800126629 - 2¹¹ = 686800124581 is a prime.

It is a super-2 number, since 2×686800126629² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686800122629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2494657 + ... + 2756249.

Almost surely, 2^686800126629 is an apocalyptic number.

It is an amenable number.

686800126629 is a deficient number, since it is larger than the sum of its proper divisors (339196131207).

686800126629 is a wasteful number, since it uses less digits than its factorization.

686800126629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294018 (or 294009 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 54.

The spelling of 686800126629 in words is "six hundred eighty-six billion, eight hundred million, one hundred twenty-six thousand, six hundred twenty-nine".