506421555543 has 32 divisors (see below), whose sum is σ = 754701105600. Its totient is φ = 335617970688.

The previous prime is 506421555529. The next prime is 506421555581. The reversal of 506421555543 is 345555124605.

506421555543 is a `hidden beast` number, since 5 + 0 + 6 + 42 + 1 + 55 + 554 + 3 = 666.

It is not a de Polignac number, because 506421555543 - 2¹³ = 506421547351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (506421555503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3816313 + ... + 3946781.

It is an arithmetic number, because the mean of its divisors is an integer number (23584409550).

Almost surely, 2^506421555543 is an apocalyptic number.

506421555543 is a deficient number, since it is larger than the sum of its proper divisors (248279550057).

506421555543 is a wasteful number, since it uses less digits than its factorization.

506421555543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131328 (or 131322 counting only the distinct ones).

The product of its (nonzero) digits is 1800000, while the sum is 45.

The spelling of 506421555543 in words is "five hundred six billion, four hundred twenty-one million, five hundred fifty-five thousand, five hundred forty-three".