24780426721 has 2 divisors, whose sum is σ = 24780426722. Its totient is φ = 24780426720.

The previous prime is 24780426709. The next prime is 24780426793. The reversal of 24780426721 is 12762408742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24512286096 + 268140625 = 156564^2 + 16375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-24780426721 is a prime.

It is a super-2 number, since 2×24780426721² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (24780526721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12390213360 + 12390213361.

It is an arithmetic number, because the mean of its divisors is an integer number (12390213361).

Almost surely, 2^24780426721 is an apocalyptic number.

It is an amenable number.

24780426721 is a deficient number, since it is larger than the sum of its proper divisors (1).

24780426721 is an equidigital number, since it uses as much as digits as its factorization.

24780426721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 301056, while the sum is 43.

The spelling of 24780426721 in words is "twenty-four billion, seven hundred eighty million, four hundred twenty-six thousand, seven hundred twenty-one".