12644553601 has 2 divisors, whose sum is σ = 12644553602. Its totient is φ = 12644553600.

The previous prime is 12644553587. The next prime is 12644553629. The reversal of 12644553601 is 10635544621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11142913600 + 1501640001 = 105560^2 + 38751^2 .

It is a cyclic number.

It is not a de Polignac number, because 12644553601 - 2⁷ = 12644553473 is a prime.

It is a super-3 number, since 3×12644553601³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (12644553661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322276800 + 6322276801.

It is an arithmetic number, because the mean of its divisors is an integer number (6322276801).

Almost surely, 2^12644553601 is an apocalyptic number.

It is an amenable number.

12644553601 is a deficient number, since it is larger than the sum of its proper divisors (1).

12644553601 is an equidigital number, since it uses as much as digits as its factorization.

12644553601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 12644553601 in words is "twelve billion, six hundred forty-four million, five hundred fifty-three thousand, six hundred one".