13681720850 has 48 divisors (see below), whose sum is σ = 29355317568. Its totient is φ = 4647023040.

The previous prime is 13681720847. The next prime is 13681720859. The reversal of 13681720850 is 5802718631.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13681720798 and 13681720807.

It is not an unprimeable number, because it can be changed into a prime (13681720859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145217 + ... + 220116.

It is an arithmetic number, because the mean of its divisors is an integer number (611569116).

Almost surely, 2^13681720850 is an apocalyptic number.

13681720850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

13681720850 is an abundant number, since it is smaller than the sum of its proper divisors (15673596718).

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

13681720850 is a wasteful number, since it uses less digits than its factorization.

13681720850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365459 (or 365454 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The spelling of 13681720850 in words is "thirteen billion, six hundred eighty-one million, seven hundred twenty thousand, eight hundred fifty".