12642217809 has 16 divisors (see below), whose sum is σ = 18155136384. Its totient is φ = 7778880000.

The previous prime is 12642217771. The next prime is 12642217811. The reversal of 12642217809 is 90871224621.

It is not a de Polignac number, because 12642217809 - 2⁷ = 12642217681 is a prime.

It is a super-2 number, since 2×12642217809² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12642216809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441684 + ... + 469434.

It is an arithmetic number, because the mean of its divisors is an integer number (1134696024).

Almost surely, 2^12642217809 is an apocalyptic number.

It is an amenable number.

12642217809 is a deficient number, since it is larger than the sum of its proper divisors (5512918575).

12642217809 is a wasteful number, since it uses less digits than its factorization.

12642217809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39448.

The product of its (nonzero) digits is 96768, while the sum is 42.

The spelling of 12642217809 in words is "twelve billion, six hundred forty-two million, two hundred seventeen thousand, eight hundred nine".