12640264326 has 40 divisors (see below), whose sum is σ = 28457867064. Its totient is φ = 4193441280.

The previous prime is 12640264321. The next prime is 12640264333. The reversal of 12640264326 is 62346204621.

12640264326 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 0 + 2 + 643 + 2 + 6 = 666.

It is a super-2 number, since 2×12640264326² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12640264321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 150715 + ... + 219078.

Almost surely, 2^12640264326 is an apocalyptic number.

12640264326 is an abundant number, since it is smaller than the sum of its proper divisors (15817602738).

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

12640264326 is a wasteful number, since it uses less digits than its factorization.

12640264326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370018 (or 370009 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

Adding to 12640264326 its reverse (62346204621), we get a palindrome (74986468947).

The spelling of 12640264326 in words is "twelve billion, six hundred forty million, two hundred sixty-four thousand, three hundred twenty-six".