13609721648 has 10 divisors (see below), whose sum is σ = 26368835724. Its totient is φ = 6804860816.

The previous prime is 13609721647. The next prime is 13609721731. The reversal of 13609721648 is 84612790631.

It is not an unprimeable number, because it can be changed into a prime (13609721647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425303786 + ... + 425303817.

Almost surely, 2^13609721648 is an apocalyptic number.

It is an amenable number.

13609721648 is a deficient number, since it is larger than the sum of its proper divisors (12759114076).

13609721648 is an equidigital number, since it uses as much as digits as its factorization.

13609721648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850607611 (or 850607605 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 13609721648 in words is "thirteen billion, six hundred nine million, seven hundred twenty-one thousand, six hundred forty-eight".