42742224181 has 2 divisors, whose sum is σ = 42742224182. Its totient is φ = 42742224180.

The previous prime is 42742224169. The next prime is 42742224341. The reversal of 42742224181 is 18142224724.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42421993156 + 320231025 = 205966^2 + 17895^2 .

It is a cyclic number.

It is not a de Polignac number, because 42742224181 - 2⁷ = 42742224053 is a prime.

It is a super-2 number, since 2×42742224181² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 42742224181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42742224121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21371112090 + 21371112091.

It is an arithmetic number, because the mean of its divisors is an integer number (21371112091).

Almost surely, 2^42742224181 is an apocalyptic number.

It is an amenable number.

42742224181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42742224181 is an equidigital number, since it uses as much as digits as its factorization.

42742224181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57344, while the sum is 37.

The spelling of 42742224181 in words is "forty-two billion, seven hundred forty-two million, two hundred twenty-four thousand, one hundred eighty-one".