12640280009 has 4 divisors (see below), whose sum is σ = 14446034304. Its totient is φ = 10834525716.

The previous prime is 12640279999. The next prime is 12640280017. The reversal of 12640280009 is 90008204621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12640280009 - 2¹² = 12640275913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12640280069) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 902877137 + ... + 902877150.

It is an arithmetic number, because the mean of its divisors is an integer number (3611508576).

Almost surely, 2^12640280009 is an apocalyptic number.

It is an amenable number.

12640280009 is a deficient number, since it is larger than the sum of its proper divisors (1805754295).

12640280009 is an equidigital number, since it uses as much as digits as its factorization.

12640280009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1805754294.

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 12640280009 its sum of digits (32), we get a square (12640280041 = 112429²).

The spelling of 12640280009 in words is "twelve billion, six hundred forty million, two hundred eighty thousand, nine".