42881815085 has 4 divisors (see below), whose sum is σ = 51458178108. Its totient is φ = 34305452064.

The previous prime is 42881815073. The next prime is 42881815099. The reversal of 42881815085 is 58051818824.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32347461316 + 10534353769 = 179854^2 + 102637^2 .

It is a cyclic number.

It is not a de Polignac number, because 42881815085 - 2⁴ = 42881815069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4288181504 + ... + 4288181513.

It is an arithmetic number, because the mean of its divisors is an integer number (12864544527).

Almost surely, 2^42881815085 is an apocalyptic number.

It is an amenable number.

42881815085 is a deficient number, since it is larger than the sum of its proper divisors (8576363023).

42881815085 is an equidigital number, since it uses as much as digits as its factorization.

42881815085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8576363022.

The product of its (nonzero) digits is 819200, while the sum is 50.

The spelling of 42881815085 in words is "forty-two billion, eight hundred eighty-one million, eight hundred fifteen thousand, eighty-five".