42065663633641 has 4 divisors (see below), whose sum is σ = 42065740683652. Its totient is φ = 42065586583632.

The previous prime is 42065663633639. The next prime is 42065663633683. The reversal of 42065663633641 is 14633636656024.

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 24910120928016 + 17155542705625 = 4991004^2 + 4141925^2 .

It is a cyclic number.

It is not a de Polignac number, because 42065663633641 - 2¹ = 42065663633639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42065663636641) 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, 37700190 + ... + 38799943.

It is an arithmetic number, because the mean of its divisors is an integer number (10516435170913).

Almost surely, 2^{42065663633641} is an apocalyptic number.

It is an amenable number.

42065663633641 is a deficient number, since it is larger than the sum of its proper divisors (77050011).

42065663633641 is an equidigital number, since it uses as much as digits as its factorization.

42065663633641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77050010.

The product of its (nonzero) digits is 33592320, while the sum is 55.

The spelling of 42065663633641 in words is "forty-two trillion, sixty-five billion, six hundred sixty-three million, six hundred thirty-three thousand, six hundred forty-one".