42501423161 has 2 divisors, whose sum is σ = 42501423162. Its totient is φ = 42501423160.

The previous prime is 42501423143. The next prime is 42501423163. The reversal of 42501423161 is 16132410524.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27873972025 + 14627451136 = 166955^2 + 120944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42501423161 is a prime.

Together with 42501423163, 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 (42501423163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21250711580 + 21250711581.

It is an arithmetic number, because the mean of its divisors is an integer number (21250711581).

Almost surely, 2^42501423161 is an apocalyptic number.

It is an amenable number.

42501423161 is a deficient number, since it is larger than the sum of its proper divisors (1).

42501423161 is an equidigital number, since it uses as much as digits as its factorization.

42501423161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 42501423161 its reverse (16132410524), we get a palindrome (58633833685).

The spelling of 42501423161 in words is "forty-two billion, five hundred one million, four hundred twenty-three thousand, one hundred sixty-one".