42585031871 has 4 divisors (see below), whose sum is σ = 42611699112. Its totient is φ = 42558364632.

The previous prime is 42585031861. The next prime is 42585031891. The reversal of 42585031871 is 17813058524.

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 42585031871 - 2¹⁸ = 42584769727 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 (42585031861) 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, 13331225 + ... + 13334418.

It is an arithmetic number, because the mean of its divisors is an integer number (10652924778).

Almost surely, 2^42585031871 is an apocalyptic number.

42585031871 is a deficient number, since it is larger than the sum of its proper divisors (26667241).

42585031871 is a wasteful number, since it uses less digits than its factorization.

42585031871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26667240.

The product of its (nonzero) digits is 268800, while the sum is 44.

The spelling of 42585031871 in words is "forty-two billion, five hundred eighty-five million, thirty-one thousand, eight hundred seventy-one".