42718831691 has 4 divisors (see below), whose sum is σ = 42743370384. Its totient is φ = 42694293000.

The previous prime is 42718831679. The next prime is 42718831709. The reversal of 42718831691 is 19613881724.

It is a happy number.

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 42718831691 - 2³⁰ = 41645089867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42718831291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12266735 + ... + 12270216.

It is an arithmetic number, because the mean of its divisors is an integer number (10685842596).

Almost surely, 2^42718831691 is an apocalyptic number.

42718831691 is a deficient number, since it is larger than the sum of its proper divisors (24538693).

42718831691 is a wasteful number, since it uses less digits than its factorization.

42718831691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24538692.

The product of its digits is 580608, while the sum is 50.

The spelling of 42718831691 in words is "forty-two billion, seven hundred eighteen million, eight hundred thirty-one thousand, six hundred ninety-one".