12691723201688 has 16 divisors (see below), whose sum is σ = 24098208612000. Its totient is φ = 6265534238496.

The previous prime is 12691723201649. The next prime is 12691723201793. The reversal of 12691723201688 is 88610232719621.

It is a super-2 number, since 2×12691723201688² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10040919623 + ... + 10040920886.

It is an arithmetic number, because the mean of its divisors is an integer number (1506138038250).

Almost surely, 2^{12691723201688} is an apocalyptic number.

It is an amenable number.

12691723201688 is a deficient number, since it is larger than the sum of its proper divisors (11406485410312).

12691723201688 is a wasteful number, since it uses less digits than its factorization.

12691723201688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20081840594 (or 20081840590 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 56.

The spelling of 12691723201688 in words is "twelve trillion, six hundred ninety-one billion, seven hundred twenty-three million, two hundred one thousand, six hundred eighty-eight".