12688606901 has 4 divisors (see below), whose sum is σ = 13126145100. Its totient is φ = 12251068704.

The previous prime is 12688606789. The next prime is 12688606919. The reversal of 12688606901 is 10960688621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5274535876 + 7414071025 = 72626^2 + 86105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12688606901 is a prime.

It is a super-2 number, since 2×12688606901² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688606991) 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, 218769056 + ... + 218769113.

It is an arithmetic number, because the mean of its divisors is an integer number (3281536275).

Almost surely, 2^12688606901 is an apocalyptic number.

It is an amenable number.

12688606901 is a deficient number, since it is larger than the sum of its proper divisors (437538199).

12688606901 is an equidigital number, since it uses as much as digits as its factorization.

12688606901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437538198.

The product of its (nonzero) digits is 248832, while the sum is 47.

The spelling of 12688606901 in words is "twelve billion, six hundred eighty-eight million, six hundred six thousand, nine hundred one".