42174935581 has 2 divisors, whose sum is σ = 42174935582. Its totient is φ = 42174935580.

The previous prime is 42174935533. The next prime is 42174935587. The reversal of 42174935581 is 18553947124.

It is a happy number.

42174935581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32712509956 + 9462425625 = 180866^2 + 97275^2 .

It is a cyclic number.

It is not a de Polignac number, because 42174935581 - 2⁹ = 42174935069 is a prime.

It is a super-2 number, since 2×42174935581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42174935587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21087467790 + 21087467791.

It is an arithmetic number, because the mean of its divisors is an integer number (21087467791).

Almost surely, 2^42174935581 is an apocalyptic number.

It is an amenable number.

42174935581 is a deficient number, since it is larger than the sum of its proper divisors (1).

42174935581 is an equidigital number, since it uses as much as digits as its factorization.

42174935581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 49.

The spelling of 42174935581 in words is "forty-two billion, one hundred seventy-four million, nine hundred thirty-five thousand, five hundred eighty-one".