12640442106 has 96 divisors (see below), whose sum is σ = 28463762880. Its totient is φ = 3734886400.

The previous prime is 12640442069. The next prime is 12640442161. The reversal of 12640442106 is 60124404621.

It is a happy number.

It is a super-3 number, since 3×12640442106³ (a number of 31 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2058661 + ... + 2064791.

It is an arithmetic number, because the mean of its divisors is an integer number (296497530).

Almost surely, 2^12640442106 is an apocalyptic number.

12640442106 is an abundant number, since it is smaller than the sum of its proper divisors (15823320774).

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

12640442106 is a wasteful number, since it uses less digits than its factorization.

12640442106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6240 (or 6223 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 30.

Adding to 12640442106 its reverse (60124404621), we get a palindrome (72764846727).

The spelling of 12640442106 in words is "twelve billion, six hundred forty million, four hundred forty-two thousand, one hundred six".