42165566563 has 4 divisors (see below), whose sum is σ = 42169932640. Its totient is φ = 42161200488.

The previous prime is 42165566561. The next prime is 42165566567. The reversal of 42165566563 is 36566556124.

42165566563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42165566563 - 2¹ = 42165566561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42165566561) 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, 2168520 + ... + 2187877.

It is an arithmetic number, because the mean of its divisors is an integer number (10542483160).

Almost surely, 2^42165566563 is an apocalyptic number.

42165566563 is a deficient number, since it is larger than the sum of its proper divisors (4366077).

42165566563 is an equidigital number, since it uses as much as digits as its factorization.

42165566563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4366076.

The product of its digits is 3888000, while the sum is 49.

The spelling of 42165566563 in words is "forty-two billion, one hundred sixty-five million, five hundred sixty-six thousand, five hundred sixty-three".