13665840280 has 64 divisors (see below), whose sum is σ = 31310697600. Its totient is φ = 5367098880.

The previous prime is 13665840271. The next prime is 13665840289. The reversal of 13665840280 is 8204856631.

It is an interprime number because it is at equal distance from previous prime (13665840271) and next prime (13665840289).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13665840289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560014 + ... + 583906.

It is an arithmetic number, because the mean of its divisors is an integer number (489229650).

Almost surely, 2^13665840280 is an apocalyptic number.

13665840280 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 13665840280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15655348800).

13665840280 is an abundant number, since it is smaller than the sum of its proper divisors (17644857320).

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

13665840280 is a wasteful number, since it uses less digits than its factorization.

13665840280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24164 (or 24160 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 13665840280 in words is "thirteen billion, six hundred sixty-five million, eight hundred forty thousand, two hundred eighty".