12640321162 has 24 divisors (see below), whose sum is σ = 22061462400. Its totient is φ = 5415956280.

The previous prime is 12640321139. The next prime is 12640321181. The reversal of 12640321162 is 26112304621.

It is a self number, because there is not a number n which added to its sum of digits gives 12640321162.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460089 + ... + 486787.

It is an arithmetic number, because the mean of its divisors is an integer number (919227600).

Almost surely, 2^12640321162 is an apocalyptic number.

12640321162 is a deficient number, since it is larger than the sum of its proper divisors (9421141238).

12640321162 is a wasteful number, since it uses less digits than its factorization.

12640321162 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31546 (or 31539 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 12640321162 its reverse (26112304621), we get a palindrome (38752625783).

The spelling of 12640321162 in words is "twelve billion, six hundred forty million, three hundred twenty-one thousand, one hundred sixty-two".