42545025161 has 2 divisors, whose sum is σ = 42545025162. Its totient is φ = 42545025160.

The previous prime is 42545025121. The next prime is 42545025203. The reversal of 42545025161 is 16152054524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24729449536 + 17815575625 = 157256^2 + 133475^2 .

It is a cyclic number.

It is not a de Polignac number, because 42545025161 - 2¹⁸ = 42544763017 is a prime.

It is not a weakly prime, because it can be changed into another prime (42545025101) 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 as a sum of consecutive naturals, namely, 21272512580 + 21272512581.

It is an arithmetic number, because the mean of its divisors is an integer number (21272512581).

Almost surely, 2^42545025161 is an apocalyptic number.

It is an amenable number.

42545025161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42545025161 is an equidigital number, since it uses as much as digits as its factorization.

42545025161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 35.

Adding to 42545025161 its reverse (16152054524), we get a palindrome (58697079685).

The spelling of 42545025161 in words is "forty-two billion, five hundred forty-five million, twenty-five thousand, one hundred sixty-one".