42565220645 has 8 divisors (see below), whose sum is σ = 51089690520. Its totient is φ = 34044559360.

The previous prime is 42565220639. The next prime is 42565220647. The reversal of 42565220645 is 54602256524.

42565220645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10372607716 + 32192612929 = 101846^2 + 179423^2 .

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

It is not a de Polignac number, because 42565220645 - 2²⁰ = 42564172069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42565220647) 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, 927500 + ... + 972309.

It is an arithmetic number, because the mean of its divisors is an integer number (6386211315).

Almost surely, 2^42565220645 is an apocalyptic number.

It is an amenable number.

42565220645 is a deficient number, since it is larger than the sum of its proper divisors (8524469875).

42565220645 is a wasteful number, since it uses less digits than its factorization.

42565220645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904295.

The product of its (nonzero) digits is 576000, while the sum is 41.

The spelling of 42565220645 in words is "forty-two billion, five hundred sixty-five million, two hundred twenty thousand, six hundred forty-five".