42718839991 has 4 divisors (see below), whose sum is σ = 43873403272. Its totient is φ = 41564276712.

The previous prime is 42718839971. The next prime is 42718840027. The reversal of 42718839991 is 19993881724.

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 42718839991 - 2¹¹ = 42718837943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42718839901) 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, 577281585 + ... + 577281658.

It is an arithmetic number, because the mean of its divisors is an integer number (10968350818).

Almost surely, 2^42718839991 is an apocalyptic number.

42718839991 is a deficient number, since it is larger than the sum of its proper divisors (1154563281).

42718839991 is a wasteful number, since it uses less digits than its factorization.

42718839991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154563280.

The product of its digits is 7838208, while the sum is 61.

The spelling of 42718839991 in words is "forty-two billion, seven hundred eighteen million, eight hundred thirty-nine thousand, nine hundred ninety-one".