42918916639 has 4 divisors (see below), whose sum is σ = 43001295120. Its totient is φ = 42836538160.

The previous prime is 42918916627. The next prime is 42918916681. The reversal of 42918916639 is 93661981924.

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-42918916639 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42918916609) 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, 41188459 + ... + 41189500.

It is an arithmetic number, because the mean of its divisors is an integer number (10750323780).

Almost surely, 2^42918916639 is an apocalyptic number.

42918916639 is a deficient number, since it is larger than the sum of its proper divisors (82378481).

42918916639 is an equidigital number, since it uses as much as digits as its factorization.

42918916639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82378480.

The product of its digits is 5038848, while the sum is 58.

The spelling of 42918916639 in words is "forty-two billion, nine hundred eighteen million, nine hundred sixteen thousand, six hundred thirty-nine".