12664001 has 6 divisors (see below), whose sum is σ = 14731650. Its totient is φ = 10854816.

The previous prime is 12663991. The next prime is 12664019. The reversal of 12664001 is 10046621.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 5400976 = 2695^2 + 2324^2 .

It is not a de Polignac number, because 12664001 - 2¹⁴ = 12647617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12664021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 129176 + ... + 129273.

It is an arithmetic number, because the mean of its divisors is an integer number (2455275).

Almost surely, 2^12664001 is an apocalyptic number.

It is an amenable number.

12664001 is a deficient number, since it is larger than the sum of its proper divisors (2067649).

12664001 is an equidigital number, since it uses as much as digits as its factorization.

12664001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258463 (or 258456 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12664001 is about 3558.6515704688. The cubic root of 12664001 is about 233.0900018858.

The spelling of 12664001 in words is "twelve million, six hundred sixty-four thousand, one".