13643497971668 has 12 divisors (see below), whose sum is σ = 24107928455520. Its totient is φ = 6755518412952.

The previous prime is 13643497971661. The next prime is 13643497971679. The reversal of 13643497971668 is 86617979434631.

It is a super-2 number, since 2×13643497971668² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 13643497971595 and 13643497971604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13643497971661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16557642758 + ... + 16557643581.

It is an arithmetic number, because the mean of its divisors is an integer number (2008994037960).

Almost surely, 2^{13643497971668} is an apocalyptic number.

It is an amenable number.

13643497971668 is a deficient number, since it is larger than the sum of its proper divisors (10464430483852).

13643497971668 is a wasteful number, since it uses less digits than its factorization.

13643497971668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33115286446 (or 33115286444 counting only the distinct ones).

The product of its digits is 987614208, while the sum is 74.

The spelling of 13643497971668 in words is "thirteen trillion, six hundred forty-three billion, four hundred ninety-seven million, nine hundred seventy-one thousand, six hundred sixty-eight".