13666398749484 has 96 divisors (see below), whose sum is σ = 35455238977536. Its totient is φ = 4068681546240.

The previous prime is 13666398749467. The next prime is 13666398749489. The reversal of 13666398749484 is 48494789366631.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is not an unprimeable number, because it can be changed into a prime (13666398749489) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27497839 + ... + 27990425.

It is an arithmetic number, because the mean of its divisors is an integer number (369325406016).

Almost surely, 2^{13666398749484} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13666398749484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17727619488768).

13666398749484 is an abundant number, since it is smaller than the sum of its proper divisors (21788840228052).

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

13666398749484 is a wasteful number, since it uses less digits than its factorization.

13666398749484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498375 (or 498373 counting only the distinct ones).

The product of its digits is 4514807808, while the sum is 78.

The spelling of 13666398749484 in words is "thirteen trillion, six hundred sixty-six billion, three hundred ninety-eight million, seven hundred forty-nine thousand, four hundred eighty-four".