8557421543 has 4 divisors (see below), whose sum is σ = 9335368968. Its totient is φ = 7779474120.

The previous prime is 8557421527. The next prime is 8557421573. The reversal of 8557421543 is 3451247558.

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

It is not a de Polignac number, because 8557421543 - 2⁴ = 8557421527 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 8557421494 and 8557421503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8557421573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388973696 + ... + 388973717.

It is an arithmetic number, because the mean of its divisors is an integer number (2333842242).

Almost surely, 2^8557421543 is an apocalyptic number.

8557421543 is a deficient number, since it is larger than the sum of its proper divisors (777947425).

8557421543 is a wasteful number, since it uses less digits than its factorization.

8557421543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777947424.

The product of its digits is 672000, while the sum is 44.

The square root of 8557421543 is about 92506.3324481087. The cubic root of 8557421543 is about 2045.4128281044.

The spelling of 8557421543 in words is "eight billion, five hundred fifty-seven million, four hundred twenty-one thousand, five hundred forty-three".