6557423981819 has 4 divisors (see below), whose sum is σ = 6622348971840. Its totient is φ = 6492498991800.

The previous prime is 6557423981749. The next prime is 6557423981839. The reversal of 6557423981819 is 9181893247556.

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

It is a cyclic number.

It is not a de Polignac number, because 6557423981819 - 2²⁴ = 6557407204603 is a prime.

It is a super-2 number, since 2×6557423981819² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6557423981839) 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, 32462494859 + ... + 32462495060.

It is an arithmetic number, because the mean of its divisors is an integer number (1655587242960).

Almost surely, 2^{6557423981819} is an apocalyptic number.

6557423981819 is a deficient number, since it is larger than the sum of its proper divisors (64924990021).

6557423981819 is a wasteful number, since it uses less digits than its factorization.

6557423981819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64924990020.

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

The spelling of 6557423981819 in words is "six trillion, five hundred fifty-seven billion, four hundred twenty-three million, nine hundred eighty-one thousand, eight hundred nineteen".