13685242520 has 64 divisors (see below), whose sum is σ = 31350654720. Its totient is φ = 5375542144.

The previous prime is 13685242507. The next prime is 13685242561. The reversal of 13685242520 is 2524258631.

It is a happy number.

It is a congruent number.

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, 542099 + ... + 566781.

It is an arithmetic number, because the mean of its divisors is an integer number (489853980).

Almost surely, 2^13685242520 is an apocalyptic number.

13685242520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13685242520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15675327360).

13685242520 is an abundant number, since it is smaller than the sum of its proper divisors (17665412200).

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

13685242520 is a wasteful number, since it uses less digits than its factorization.

13685242520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24944 (or 24940 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 38.

The spelling of 13685242520 in words is "thirteen billion, six hundred eighty-five million, two hundred forty-two thousand, five hundred twenty".