42542666563 has 4 divisors (see below), whose sum is σ = 43692468400. Its totient is φ = 41392864728.

The previous prime is 42542666561. The next prime is 42542666597. The reversal of 42542666563 is 36566624524.

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 42542666563 - 2¹ = 42542666561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42542666561) 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, 574900863 + ... + 574900936.

It is an arithmetic number, because the mean of its divisors is an integer number (10923117100).

Almost surely, 2^42542666563 is an apocalyptic number.

42542666563 is a deficient number, since it is larger than the sum of its proper divisors (1149801837).

42542666563 is a wasteful number, since it uses less digits than its factorization.

42542666563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149801836.

The product of its digits is 6220800, while the sum is 49.

The spelling of 42542666563 in words is "forty-two billion, five hundred forty-two million, six hundred sixty-six thousand, five hundred sixty-three".