6388888897 has 4 divisors (see below), whose sum is σ = 6393169620. Its totient is φ = 6384608176.

The previous prime is 6388888889. The next prime is 6388888969. The reversal of 6388888897 is 7988888836.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5770073521 + 618815376 = 75961^2 + 24876^2 .

It is a cyclic number.

It is not a de Polignac number, because 6388888897 - 2³ = 6388888889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6388888867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2138122 + ... + 2141107.

It is an arithmetic number, because the mean of its divisors is an integer number (1598292405).

Almost surely, 2^6388888897 is an apocalyptic number.

It is an amenable number.

6388888897 is a deficient number, since it is larger than the sum of its proper divisors (4280723).

6388888897 is a wasteful number, since it uses less digits than its factorization.

6388888897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4280722.

The product of its digits is 297271296, while the sum is 73.

The square root of 6388888897 is about 79930.5254392838. The cubic root of 6388888897 is about 1855.5604699868.

The spelling of 6388888897 in words is "six billion, three hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred ninety-seven".