42205217623 has 4 divisors (see below), whose sum is σ = 43566676288. Its totient is φ = 40843758960.

The previous prime is 42205217581. The next prime is 42205217687. The reversal of 42205217623 is 32671250224.

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 42205217623 - 2¹⁷ = 42205086551 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 (42205217023) 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, 680729286 + ... + 680729347.

It is an arithmetic number, because the mean of its divisors is an integer number (10891669072).

Almost surely, 2^42205217623 is an apocalyptic number.

42205217623 is a deficient number, since it is larger than the sum of its proper divisors (1361458665).

42205217623 is a wasteful number, since it uses less digits than its factorization.

42205217623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361458664.

The product of its (nonzero) digits is 40320, while the sum is 34.

Adding to 42205217623 its reverse (32671250224), we get a palindrome (74876467847).

The spelling of 42205217623 in words is "forty-two billion, two hundred five million, two hundred seventeen thousand, six hundred twenty-three".