42404352181 has 2 divisors, whose sum is σ = 42404352182. Its totient is φ = 42404352180.

The previous prime is 42404352167. The next prime is 42404352239. The reversal of 42404352181 is 18125340424.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29071955025 + 13332397156 = 170505^2 + 115466^2 .

It is a cyclic number.

It is not a de Polignac number, because 42404352181 - 2⁵ = 42404352149 is a prime.

It is a super-4 number, since 4×42404352181⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42404352281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21202176090 + 21202176091.

It is an arithmetic number, because the mean of its divisors is an integer number (21202176091).

Almost surely, 2^42404352181 is an apocalyptic number.

It is an amenable number.

42404352181 is a deficient number, since it is larger than the sum of its proper divisors (1).

42404352181 is an equidigital number, since it uses as much as digits as its factorization.

42404352181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 34.

The spelling of 42404352181 in words is "forty-two billion, four hundred four million, three hundred fifty-two thousand, one hundred eighty-one".