42171562543 has 4 divisors (see below), whose sum is σ = 46005340968. Its totient is φ = 38337784120.

The previous prime is 42171562541. The next prime is 42171562547. The reversal of 42171562543 is 34526517124.

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 42171562543 - 2¹ = 42171562541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42171562496 and 42171562505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42171562541) 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, 1916889196 + ... + 1916889217.

It is an arithmetic number, because the mean of its divisors is an integer number (11501335242).

Almost surely, 2^42171562543 is an apocalyptic number.

42171562543 is a deficient number, since it is larger than the sum of its proper divisors (3833778425).

42171562543 is a wasteful number, since it uses less digits than its factorization.

42171562543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3833778424.

The product of its digits is 201600, while the sum is 40.

The spelling of 42171562543 in words is "forty-two billion, one hundred seventy-one million, five hundred sixty-two thousand, five hundred forty-three".