42851521855 has 4 divisors (see below), whose sum is σ = 51421826232. Its totient is φ = 34281217480.

The previous prime is 42851521837. The next prime is 42851521859. The reversal of 42851521855 is 55812515824.

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

It is not a de Polignac number, because 42851521855 - 2³³ = 34261587263 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 (42851521859) 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, 4285152181 + ... + 4285152190.

It is an arithmetic number, because the mean of its divisors is an integer number (12855456558).

Almost surely, 2^42851521855 is an apocalyptic number.

42851521855 is a deficient number, since it is larger than the sum of its proper divisors (8570304377).

42851521855 is an equidigital number, since it uses as much as digits as its factorization.

42851521855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8570304376.

The product of its digits is 640000, while the sum is 46.

The spelling of 42851521855 in words is "forty-two billion, eight hundred fifty-one million, five hundred twenty-one thousand, eight hundred fifty-five".