12644426033 has 4 divisors (see below), whose sum is σ = 13309922160. Its totient is φ = 11978929908.

The previous prime is 12644426029. The next prime is 12644426051. The reversal of 12644426033 is 33062444621.

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 a cyclic number.

It is not a de Polignac number, because 12644426033 - 2² = 12644426029 is a prime.

It is a super-3 number, since 3×12644426033³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12644425984 and 12644426002.

It is not an unprimeable number, because it can be changed into a prime (12644426023) 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, 332748035 + ... + 332748072.

It is an arithmetic number, because the mean of its divisors is an integer number (3327480540).

Almost surely, 2^12644426033 is an apocalyptic number.

It is an amenable number.

12644426033 is a deficient number, since it is larger than the sum of its proper divisors (665496127).

12644426033 is an equidigital number, since it uses as much as digits as its factorization.

12644426033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665496126.

The product of its (nonzero) digits is 82944, while the sum is 35.

The spelling of 12644426033 in words is "twelve billion, six hundred forty-four million, four hundred twenty-six thousand, thirty-three".