42340385081 has 2 divisors, whose sum is σ = 42340385082. Its totient is φ = 42340385080.

The previous prime is 42340385041. The next prime is 42340385111. The reversal of 42340385081 is 18058304324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27501247225 + 14839137856 = 165835^2 + 121816^2 .

It is a cyclic number.

It is not a de Polignac number, because 42340385081 - 2¹⁰ = 42340384057 is a prime.

It is a super-2 number, since 2×42340385081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42340385041) 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, 21170192540 + 21170192541.

It is an arithmetic number, because the mean of its divisors is an integer number (21170192541).

Almost surely, 2^42340385081 is an apocalyptic number.

It is an amenable number.

42340385081 is a deficient number, since it is larger than the sum of its proper divisors (1).

42340385081 is an equidigital number, since it uses as much as digits as its factorization.

42340385081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92160, while the sum is 38.

The spelling of 42340385081 in words is "forty-two billion, three hundred forty million, three hundred eighty-five thousand, eighty-one".