6399525889 has 4 divisors (see below), whose sum is σ = 6605962240. Its totient is φ = 6193089540.

The previous prime is 6399525841. The next prime is 6399525893. The reversal of 6399525889 is 9885259936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6399525889 - 2⁷ = 6399525761 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6399525889.

It is not an unprimeable number, because it can be changed into a prime (6399525829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103218129 + ... + 103218190.

It is an arithmetic number, because the mean of its divisors is an integer number (1651490560).

Almost surely, 2^6399525889 is an apocalyptic number.

It is an amenable number.

6399525889 is a deficient number, since it is larger than the sum of its proper divisors (206436351).

6399525889 is a wasteful number, since it uses less digits than its factorization.

6399525889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206436350.

The product of its digits is 41990400, while the sum is 64.

The square root of 6399525889 is about 79997.0367513697. The cubic root of 6399525889 is about 1856.5896858896.

The spelling of 6399525889 in words is "six billion, three hundred ninety-nine million, five hundred twenty-five thousand, eight hundred eighty-nine".