42678455845 has 4 divisors (see below), whose sum is σ = 51214147020. Its totient is φ = 34142764672.

The previous prime is 42678455843. The next prime is 42678455863. The reversal of 42678455845 is 54855487624.

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 16025281281 + 26653174564 = 126591^2 + 163258^2 .

It is a cyclic number.

It is not a de Polignac number, because 42678455845 - 2¹ = 42678455843 is a prime.

It is a super-2 number, since 2×42678455845² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 42678455845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42678455843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4267845580 + ... + 4267845589.

It is an arithmetic number, because the mean of its divisors is an integer number (12803536755).

Almost surely, 2^42678455845 is an apocalyptic number.

It is an amenable number.

42678455845 is a deficient number, since it is larger than the sum of its proper divisors (8535691175).

42678455845 is an equidigital number, since it uses as much as digits as its factorization.

42678455845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8535691174.

The product of its digits is 43008000, while the sum is 58.

The spelling of 42678455845 in words is "forty-two billion, six hundred seventy-eight million, four hundred fifty-five thousand, eight hundred forty-five".