42801991871 has 4 divisors (see below), whose sum is σ = 42809683200. Its totient is φ = 42794300544.

The previous prime is 42801991853. The next prime is 42801991877. The reversal of 42801991871 is 17819910824.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42801991871 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 (42801991877) 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, 3837311 + ... + 3848448.

It is an arithmetic number, because the mean of its divisors is an integer number (10702420800).

Almost surely, 2^42801991871 is an apocalyptic number.

42801991871 is a deficient number, since it is larger than the sum of its proper divisors (7691329).

42801991871 is an equidigital number, since it uses as much as digits as its factorization.

42801991871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7691328.

The product of its (nonzero) digits is 290304, while the sum is 50.

The spelling of 42801991871 in words is "forty-two billion, eight hundred one million, nine hundred ninety-one thousand, eight hundred seventy-one".