42064227781 has 4 divisors (see below), whose sum is σ = 42065541772. Its totient is φ = 42062913792.

The previous prime is 42064227773. The next prime is 42064227811. The reversal of 42064227781 is 18772246024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28428994881 + 13635232900 = 168609^2 + 116770^2 .

It is a cyclic number.

It is not a de Polignac number, because 42064227781 - 2³ = 42064227773 is a prime.

It is a super-2 number, since 2×42064227781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42064227721) 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 in 3 ways as a sum of consecutive naturals, for example, 607746 + ... + 673411.

It is an arithmetic number, because the mean of its divisors is an integer number (10516385443).

Almost surely, 2^42064227781 is an apocalyptic number.

It is an amenable number.

42064227781 is a deficient number, since it is larger than the sum of its proper divisors (1313991).

42064227781 is a wasteful number, since it uses less digits than its factorization.

42064227781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313990.

The product of its (nonzero) digits is 301056, while the sum is 43.

The spelling of 42064227781 in words is "forty-two billion, sixty-four million, two hundred twenty-seven thousand, seven hundred eighty-one".