42895041661 has 2 divisors, whose sum is σ = 42895041662. Its totient is φ = 42895041660.

The previous prime is 42895041659. The next prime is 42895041691. The reversal of 42895041661 is 16614059824.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40172184900 + 2722856761 = 200430^2 + 52181^2 .

It is a cyclic number.

It is not a de Polignac number, because 42895041661 - 2¹ = 42895041659 is a prime.

Together with 42895041659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42895041641) 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, 21447520830 + 21447520831.

It is an arithmetic number, because the mean of its divisors is an integer number (21447520831).

Almost surely, 2^42895041661 is an apocalyptic number.

It is an amenable number.

42895041661 is a deficient number, since it is larger than the sum of its proper divisors (1).

42895041661 is an equidigital number, since it uses as much as digits as its factorization.

42895041661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 42895041661 in words is "forty-two billion, eight hundred ninety-five million, forty-one thousand, six hundred sixty-one".