42004156643 has 4 divisors (see below), whose sum is σ = 42271699200. Its totient is φ = 41736614088.

The previous prime is 42004156619. The next prime is 42004156651. The reversal of 42004156643 is 34665140024.

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 42004156643 - 2²⁰ = 42003108067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42004156043) 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, 133771043 + ... + 133771356.

It is an arithmetic number, because the mean of its divisors is an integer number (10567924800).

Almost surely, 2^42004156643 is an apocalyptic number.

42004156643 is a deficient number, since it is larger than the sum of its proper divisors (267542557).

42004156643 is a wasteful number, since it uses less digits than its factorization.

42004156643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267542556.

The product of its (nonzero) digits is 69120, while the sum is 35.

Adding to 42004156643 its reverse (34665140024), we get a palindrome (76669296667).

The spelling of 42004156643 in words is "forty-two billion, four million, one hundred fifty-six thousand, six hundred forty-three".