42665966956623 has 8 divisors (see below), whose sum is σ = 56888007233328. Its totient is φ = 28443952325504.

The previous prime is 42665966956621. The next prime is 42665966956651. The reversal of 42665966956623 is 32665966956624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42665966956623 - 2¹ = 42665966956621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42665966956621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2118936 + ... + 9477437.

It is an arithmetic number, because the mean of its divisors is an integer number (7111000904166).

Almost surely, 2^{42665966956623} is an apocalyptic number.

42665966956623 is a deficient number, since it is larger than the sum of its proper divisors (14222040276705).

42665966956623 is a wasteful number, since it uses less digits than its factorization.

42665966956623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12822793.

The product of its digits is 4534963200, while the sum is 75.

Subtracting from 42665966956623 its reverse (32665966956624), we obtain a palindrome (9999999999999).

The spelling of 42665966956623 in words is "forty-two trillion, six hundred sixty-five billion, nine hundred sixty-six million, nine hundred fifty-six thousand, six hundred twenty-three".