12725721637 has 8 divisors (see below), whose sum is σ = 14183467200. Its totient is φ = 11346773184.

The previous prime is 12725721611. The next prime is 12725721641. The reversal of 12725721637 is 73612752721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12725721637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12725721593 and 12725721602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12725721677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19698937 + ... + 19699582.

It is an arithmetic number, because the mean of its divisors is an integer number (1772933400).

Almost surely, 2^12725721637 is an apocalyptic number.

12725721637 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

12725721637 is a deficient number, since it is larger than the sum of its proper divisors (1457745563).

12725721637 is a wasteful number, since it uses less digits than its factorization.

12725721637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39398555.

The product of its digits is 246960, while the sum is 43.

The spelling of 12725721637 in words is "twelve billion, seven hundred twenty-five million, seven hundred twenty-one thousand, six hundred thirty-seven".