42545018561 has 2 divisors, whose sum is σ = 42545018562. Its totient is φ = 42545018560.

The previous prime is 42545018521. The next prime is 42545018563. The reversal of 42545018561 is 16581054524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41918467600 + 626550961 = 204740^2 + 25031^2 .

It is a cyclic number.

It is not a de Polignac number, because 42545018561 - 2⁶ = 42545018497 is a prime.

Together with 42545018563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42545018563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21272509280 + 21272509281.

It is an arithmetic number, because the mean of its divisors is an integer number (21272509281).

Almost surely, 2^42545018561 is an apocalyptic number.

It is an amenable number.

42545018561 is a deficient number, since it is larger than the sum of its proper divisors (1).

42545018561 is an equidigital number, since it uses as much as digits as its factorization.

42545018561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192000, while the sum is 41.

The spelling of 42545018561 in words is "forty-two billion, five hundred forty-five million, eighteen thousand, five hundred sixty-one".