686919853134 has 20 divisors (see below), whose sum is σ = 1539209300904. Its totient is φ = 228973284324.

The previous prime is 686919853121. The next prime is 686919853157. The reversal of 686919853134 is 431358919686.

686919853134 is a `hidden beast` number, since 6 + 8 + 6 + 9 + 1 + 98 + 531 + 3 + 4 = 666.

It is a super-2 number, since 2×686919853134² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2120122842 + ... + 2120123165.

Almost surely, 2^686919853134 is an apocalyptic number.

686919853134 is an abundant number, since it is smaller than the sum of its proper divisors (852289447770).

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

686919853134 is a wasteful number, since it uses less digits than its factorization.

686919853134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240246021 (or 4240246012 counting only the distinct ones).

The product of its digits is 33592320, while the sum is 63.

The spelling of 686919853134 in words is "six hundred eighty-six billion, nine hundred nineteen million, eight hundred fifty-three thousand, one hundred thirty-four".