686681251240 has 32 divisors (see below), whose sum is σ = 1545208565760. Its totient is φ = 274641256000.

The previous prime is 686681251213. The next prime is 686681251279. The reversal of 686681251240 is 42152186686.

It is a super-2 number, since 2×686681251240² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618736 + ... + 1325215.

It is an arithmetic number, because the mean of its divisors is an integer number (48287767680).

Almost surely, 2^686681251240 is an apocalyptic number.

It is an amenable number.

686681251240 is an abundant number, since it is smaller than the sum of its proper divisors (858527314520).

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

686681251240 is a wasteful number, since it uses less digits than its factorization.

686681251240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1952793 (or 1952789 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 686681251240 in words is "six hundred eighty-six billion, six hundred eighty-one million, two hundred fifty-one thousand, two hundred forty".