12664665426 has 32 divisors (see below), whose sum is σ = 29422366848. Its totient is φ = 3559155840.

The previous prime is 12664665373. The next prime is 12664665443. The reversal of 12664665426 is 62456646621.

It is a super-2 number, since 2×12664665426² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2469075 + ... + 2474198.

It is an arithmetic number, because the mean of its divisors is an integer number (919448964).

Almost surely, 2^12664665426 is an apocalyptic number.

12664665426 is an abundant number, since it is smaller than the sum of its proper divisors (16757701422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12664665426 is a wasteful number, since it uses less digits than its factorization.

12664665426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4943346.

The product of its digits is 2488320, while the sum is 48.

The spelling of 12664665426 in words is "twelve billion, six hundred sixty-four million, six hundred sixty-five thousand, four hundred twenty-six".