8644919489 has 2 divisors, whose sum is σ = 8644919490. Its totient is φ = 8644919488.

The previous prime is 8644919473. The next prime is 8644919533. The reversal of 8644919489 is 9849194468.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4790993089 + 3853926400 = 69217^2 + 62080^2 .

It is a cyclic number.

It is not a de Polignac number, because 8644919489 - 2⁴ = 8644919473 is a prime.

It is a super-2 number, since 2×8644919489² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8644919419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4322459744 + 4322459745.

It is an arithmetic number, because the mean of its divisors is an integer number (4322459745).

Almost surely, 2^8644919489 is an apocalyptic number.

It is an amenable number.

8644919489 is a deficient number, since it is larger than the sum of its proper divisors (1).

8644919489 is an equidigital number, since it uses as much as digits as its factorization.

8644919489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17915904, while the sum is 62.

The square root of 8644919489 is about 92978.0591806476. The cubic root of 8644919489 is about 2052.3605161865.

The spelling of 8644919489 in words is "eight billion, six hundred forty-four million, nine hundred nineteen thousand, four hundred eighty-nine".