12664775 has 6 divisors (see below), whose sum is σ = 15704352. Its totient is φ = 10131800.

The previous prime is 12664741. The next prime is 12664781. The reversal of 12664775 is 57746621.

It is a de Polignac number, because none of the positive numbers 2^k-12664775 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 253271 + ... + 253320.

It is an arithmetic number, because the mean of its divisors is an integer number (2617392).

Almost surely, 2^12664775 is an apocalyptic number.

12664775 is a deficient number, since it is larger than the sum of its proper divisors (3039577).

12664775 is an equidigital number, since it uses as much as digits as its factorization.

12664775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506601 (or 506596 counting only the distinct ones).

The product of its digits is 70560, while the sum is 38.

The square root of 12664775 is about 3558.7603178635. The cubic root of 12664775 is about 233.0947504637.

The spelling of 12664775 in words is "twelve million, six hundred sixty-four thousand, seven hundred seventy-five".