12697721647 has 8 divisors (see below), whose sum is σ = 13675888800. Its totient is φ = 11719757280.

The previous prime is 12697721633. The next prime is 12697721669. The reversal of 12697721647 is 74612779621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12697721647 - 2²⁷ = 12563503919 is a prime.

It is a super-2 number, since 2×12697721647² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12697721594 and 12697721603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12697722647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94854 + ... + 185452.

It is an arithmetic number, because the mean of its divisors is an integer number (1709486100).

Almost surely, 2^12697721647 is an apocalyptic number.

12697721647 is a deficient number, since it is larger than the sum of its proper divisors (978167153).

12697721647 is a wasteful number, since it uses less digits than its factorization.

12697721647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101393.

The product of its digits is 1778112, while the sum is 52.

The spelling of 12697721647 in words is "twelve billion, six hundred ninety-seven million, seven hundred twenty-one thousand, six hundred forty-seven".