24646664641 has 2 divisors, whose sum is σ = 24646664642. Its totient is φ = 24646664640.

The previous prime is 24646664629. The next prime is 24646664711. The reversal of 24646664641 is 14646664642.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20141570241 + 4505094400 = 141921^2 + 67120^2 .

It is a cyclic number.

It is not a de Polignac number, because 24646664641 - 2¹⁵ = 24646631873 is a prime.

It is not a weakly prime, because it can be changed into another prime (24646664611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12323332320 + 12323332321.

It is an arithmetic number, because the mean of its divisors is an integer number (12323332321).

Almost surely, 2^24646664641 is an apocalyptic number.

It is an amenable number.

24646664641 is a deficient number, since it is larger than the sum of its proper divisors (1).

24646664641 is an equidigital number, since it uses as much as digits as its factorization.

24646664641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3981312, while the sum is 49.

Subtracting from 24646664641 its reverse (14646664642), we obtain a palindrome (9999999999).

The spelling of 24646664641 in words is "twenty-four billion, six hundred forty-six million, six hundred sixty-four thousand, six hundred forty-one".