6619724389 has 2 divisors, whose sum is σ = 6619724390. Its totient is φ = 6619724388.

The previous prime is 6619724359. The next prime is 6619724437. The reversal of 6619724389 is 9834279166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3741401889 + 2878322500 = 61167^2 + 53650^2 .

It is a cyclic number.

It is not a de Polignac number, because 6619724389 - 2¹⁹ = 6619200101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6619724359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3309862194 + 3309862195.

It is an arithmetic number, because the mean of its divisors is an integer number (3309862195).

Almost surely, 2^6619724389 is an apocalyptic number.

It is an amenable number.

6619724389 is a deficient number, since it is larger than the sum of its proper divisors (1).

6619724389 is an equidigital number, since it uses as much as digits as its factorization.

6619724389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 6619724389 is about 81361.6887054343. The cubic root of 6619724389 is about 1877.6442113267.

The spelling of 6619724389 in words is "six billion, six hundred nineteen million, seven hundred twenty-four thousand, three hundred eighty-nine".