42665978879 has 4 divisors (see below), whose sum is σ = 44137219560. Its totient is φ = 41194738200.

The previous prime is 42665978867. The next prime is 42665978893. The reversal of 42665978879 is 97887956624.

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 42665978879 - 2¹⁶ = 42665913343 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 (42665978819) 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, 735620297 + ... + 735620354.

It is an arithmetic number, because the mean of its divisors is an integer number (11034304890).

Almost surely, 2^42665978879 is an apocalyptic number.

42665978879 is a deficient number, since it is larger than the sum of its proper divisors (1471240681).

42665978879 is a wasteful number, since it uses less digits than its factorization.

42665978879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471240680.

The product of its digits is 365783040, while the sum is 71.

The spelling of 42665978879 in words is "forty-two billion, six hundred sixty-five million, nine hundred seventy-eight thousand, eight hundred seventy-nine".