686813013540 has 48 divisors (see below), whose sum is σ = 2136751599360. Its totient is φ = 183150136800.

The previous prime is 686813013539. The next prime is 686813013553. The reversal of 686813013540 is 45310318686.

686813013540 is a `hidden beast` number, since 6 + 8 + 68 + 1 + 30 + 13 + 540 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 635937436 + ... + 635938515.

It is an arithmetic number, because the mean of its divisors is an integer number (44515658320).

Almost surely, 2^686813013540 is an apocalyptic number.

686813013540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

686813013540 is an abundant number, since it is smaller than the sum of its proper divisors (1449938585820).

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

686813013540 is a wasteful number, since it uses less digits than its factorization.

686813013540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271875969 (or 1271875961 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 686813013540 in words is "six hundred eighty-six billion, eight hundred thirteen million, thirteen thousand, five hundred forty".