6557889893 has 4 divisors (see below), whose sum is σ = 6943648140. Its totient is φ = 6172131648.

The previous prime is 6557889889. The next prime is 6557889911. The reversal of 6557889893 is 3989887556.

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 4089986209 + 2467903684 = 63953^2 + 49678^2 .

It is a cyclic number.

It is not a de Polignac number, because 6557889893 - 2² = 6557889889 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557889803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192879098 + ... + 192879131.

It is an arithmetic number, because the mean of its divisors is an integer number (1735912035).

Almost surely, 2^6557889893 is an apocalyptic number.

It is an amenable number.

6557889893 is a deficient number, since it is larger than the sum of its proper divisors (385758247).

6557889893 is a wasteful number, since it uses less digits than its factorization.

6557889893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385758246.

The product of its digits is 130636800, while the sum is 68.

The square root of 6557889893 is about 80980.7995329757. The cubic root of 6557889893 is about 1871.7795877180.

The spelling of 6557889893 in words is "six billion, five hundred fifty-seven million, eight hundred eighty-nine thousand, eight hundred ninety-three".