42505383845 has 4 divisors (see below), whose sum is σ = 51006460620. Its totient is φ = 34004307072.

The previous prime is 42505383779. The next prime is 42505383859. The reversal of 42505383845 is 54838350524.

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 8874958849 + 33630424996 = 94207^2 + 183386^2 .

It is a cyclic number.

It is not a de Polignac number, because 42505383845 - 2⁸ = 42505383589 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42505383845.

It is a congruent number.

It is an unprimeable number.

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, 4250538380 + ... + 4250538389.

It is an arithmetic number, because the mean of its divisors is an integer number (12751615155).

Almost surely, 2^42505383845 is an apocalyptic number.

It is an amenable number.

42505383845 is a deficient number, since it is larger than the sum of its proper divisors (8501076775).

42505383845 is an equidigital number, since it uses as much as digits as its factorization.

42505383845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8501076774.

The product of its (nonzero) digits is 2304000, while the sum is 47.

The spelling of 42505383845 in words is "forty-two billion, five hundred five million, three hundred eighty-three thousand, eight hundred forty-five".