24781145689 has 2 divisors, whose sum is σ = 24781145690. Its totient is φ = 24781145688.

The previous prime is 24781145687. The next prime is 24781145717. The reversal of 24781145689 is 98654118742.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19724798025 + 5056347664 = 140445^2 + 71108^2 .

It is a cyclic number.

It is not a de Polignac number, because 24781145689 - 2¹ = 24781145687 is a prime.

It is a super-2 number, since 2×24781145689² (a number of 22 digits) contains 22 as substring.

Together with 24781145687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (24781145687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12390572844 + 12390572845.

It is an arithmetic number, because the mean of its divisors is an integer number (12390572845).

Almost surely, 2^24781145689 is an apocalyptic number.

It is an amenable number.

24781145689 is a deficient number, since it is larger than the sum of its proper divisors (1).

24781145689 is an equidigital number, since it uses as much as digits as its factorization.

24781145689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3870720, while the sum is 55.

The spelling of 24781145689 in words is "twenty-four billion, seven hundred eighty-one million, one hundred forty-five thousand, six hundred eighty-nine".