42638233481 has 2 divisors, whose sum is σ = 42638233482. Its totient is φ = 42638233480.

The previous prime is 42638233423. The next prime is 42638233487. The reversal of 42638233481 is 18433283624.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27183765625 + 15454467856 = 164875^2 + 124316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42638233481 is a prime.

It is a super-2 number, since 2×42638233481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42638233487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21319116740 + 21319116741.

It is an arithmetic number, because the mean of its divisors is an integer number (21319116741).

Almost surely, 2^42638233481 is an apocalyptic number.

It is an amenable number.

42638233481 is a deficient number, since it is larger than the sum of its proper divisors (1).

42638233481 is an equidigital number, since it uses as much as digits as its factorization.

42638233481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 44.

The spelling of 42638233481 in words is "forty-two billion, six hundred thirty-eight million, two hundred thirty-three thousand, four hundred eighty-one".