42881209817 has 4 divisors (see below), whose sum is σ = 42996173220. Its totient is φ = 42766246416.

The previous prime is 42881209783. The next prime is 42881209837. The reversal of 42881209817 is 71890218824.

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 27499257241 + 15381952576 = 165829^2 + 124024^2 .

It is a cyclic number.

It is not a de Polignac number, because 42881209817 - 2⁶ = 42881209753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42881209837) 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, 57481142 + ... + 57481887.

It is an arithmetic number, because the mean of its divisors is an integer number (10749043305).

Almost surely, 2^42881209817 is an apocalyptic number.

It is an amenable number.

42881209817 is a deficient number, since it is larger than the sum of its proper divisors (114963403).

42881209817 is a wasteful number, since it uses less digits than its factorization.

42881209817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114963402.

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 42881209817 in words is "forty-two billion, eight hundred eighty-one million, two hundred nine thousand, eight hundred seventeen".