13246721668 has 6 divisors (see below), whose sum is σ = 23181762926. Its totient is φ = 6623360832.

The previous prime is 13246721651. The next prime is 13246721681. The reversal of 13246721668 is 86612764231.

It can be written as a sum of positive squares in only one way, i.e., 8598481984 + 4648239684 = 92728^2 + 68178^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1655840205 + ... + 1655840212.

Almost surely, 2^13246721668 is an apocalyptic number.

It is an amenable number.

13246721668 is a deficient number, since it is larger than the sum of its proper divisors (9935041258).

13246721668 is a wasteful number, since it uses less digits than its factorization.

13246721668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3311680421 (or 3311680419 counting only the distinct ones).

The product of its digits is 580608, while the sum is 46.

The spelling of 13246721668 in words is "thirteen billion, two hundred forty-six million, seven hundred twenty-one thousand, six hundred sixty-eight".