6899724889 has 2 divisors, whose sum is σ = 6899724890. Its totient is φ = 6899724888.

The previous prime is 6899724877. The next prime is 6899724899. The reversal of 6899724889 is 9884279986.

6899724889 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6192430864 + 707294025 = 78692^2 + 26595^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899724889 - 2¹³ = 6899716697 is a prime.

It is not a weakly prime, because it can be changed into another prime (6899724869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449862444 + 3449862445.

It is an arithmetic number, because the mean of its divisors is an integer number (3449862445).

Almost surely, 2^6899724889 is an apocalyptic number.

It is an amenable number.

6899724889 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899724889 is an equidigital number, since it uses as much as digits as its factorization.

6899724889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 125411328, while the sum is 70.

The square root of 6899724889 is about 83064.5826390526. The cubic root of 6899724889 is about 1903.7529596782.

The spelling of 6899724889 in words is "six billion, eight hundred ninety-nine million, seven hundred twenty-four thousand, eight hundred eighty-nine".