13685699538 has 144 divisors (see below), whose sum is σ = 35048220480. Its totient is φ = 3779335872.

The previous prime is 13685699497. The next prime is 13685699543. The reversal of 13685699538 is 83599658631.

13685699538 is a `hidden beast` number, since 1 + 3 + 6 + 8 + 5 + 6 + 99 + 538 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 76456333 + ... + 76456511.

It is an arithmetic number, because the mean of its divisors is an integer number (243390420).

Almost surely, 2^13685699538 is an apocalyptic number.

13685699538 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13685699538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17524110240).

13685699538 is an abundant number, since it is smaller than the sum of its proper divisors (21362520942).

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

13685699538 is a wasteful number, since it uses less digits than its factorization.

13685699538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 351 counting only the distinct ones).

The product of its digits is 41990400, while the sum is 63.

The spelling of 13685699538 in words is "thirteen billion, six hundred eighty-five million, six hundred ninety-nine thousand, five hundred thirty-eight".