42423732173 has 2 divisors, whose sum is σ = 42423732174. Its totient is φ = 42423732172.

The previous prime is 42423732161. The next prime is 42423732179. The reversal of 42423732173 is 37123732424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35252691049 + 7171041124 = 187757^2 + 84682^2 .

It is a cyclic number.

It is not a de Polignac number, because 42423732173 - 2¹² = 42423728077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42423732179) 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, 21211866086 + 21211866087.

It is an arithmetic number, because the mean of its divisors is an integer number (21211866087).

Almost surely, 2^42423732173 is an apocalyptic number.

It is an amenable number.

42423732173 is a deficient number, since it is larger than the sum of its proper divisors (1).

42423732173 is an equidigital number, since it uses as much as digits as its factorization.

42423732173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 38.

The spelling of 42423732173 in words is "forty-two billion, four hundred twenty-three million, seven hundred thirty-two thousand, one hundred seventy-three".