42749678791 has 4 divisors (see below), whose sum is σ = 42908599800. Its totient is φ = 42590757784.

The previous prime is 42749678749. The next prime is 42749678809. The reversal of 42749678791 is 19787694724.

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 42749678791 - 2¹¹ = 42749676743 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 (42749678591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79460101 + ... + 79460638.

It is an arithmetic number, because the mean of its divisors is an integer number (10727149950).

Almost surely, 2^42749678791 is an apocalyptic number.

42749678791 is a deficient number, since it is larger than the sum of its proper divisors (158921009).

42749678791 is a wasteful number, since it uses less digits than its factorization.

42749678791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158921008.

The product of its digits is 42674688, while the sum is 64.

The spelling of 42749678791 in words is "forty-two billion, seven hundred forty-nine million, six hundred seventy-eight thousand, seven hundred ninety-one".