12656475001 has 3 divisors (see below), whose sum is σ = 12656587503. Its totient is φ = 12656362500.

The previous prime is 12656474969. The next prime is 12656475011. The reversal of 12656475001 is 10057465621.

It is a happy number.

The square root of 12656475001 is 112501.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1108823401 + 11547651600 = 33299^2 + 107460^2 .

It is not a de Polignac number, because 12656475001 - 2⁵ = 12656474969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12656475011) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 56251 + ... + 168751.

It is an arithmetic number, because the mean of its divisors is an integer number (4218862501).

Almost surely, 2^12656475001 is an apocalyptic number.

12656475001 is the 112501-st square number.

12656475001 is the 56251-st centered octagonal number.

It is an amenable number.

12656475001 is a deficient number, since it is larger than the sum of its proper divisors (112502).

12656475001 is an frugal number, since it uses more digits than its factorization.

12656475001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225002 (or 112501 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 12656475001 in words is "twelve billion, six hundred fifty-six million, four hundred seventy-five thousand, one".