686694557836 has 48 divisors (see below), whose sum is σ = 1434025555200. Its totient is φ = 281493834048.

The previous prime is 686694557777. The next prime is 686694557851. The reversal of 686694557836 is 638755496686.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3864906 + ... + 4038673.

It is an arithmetic number, because the mean of its divisors is an integer number (29875532400).

Almost surely, 2^686694557836 is an apocalyptic number.

It is an amenable number.

686694557836 is an abundant number, since it is smaller than the sum of its proper divisors (747330997364).

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

686694557836 is a wasteful number, since it uses less digits than its factorization.

686694557836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903726 (or 7903724 counting only the distinct ones).

The product of its digits is 1567641600, while the sum is 73.

It can be divided in two parts, 6866945 and 57836, that added together give a triangular number (6924781 = T₃₇₂₁).

The spelling of 686694557836 in words is "six hundred eighty-six billion, six hundred ninety-four million, five hundred fifty-seven thousand, eight hundred thirty-six".