42878538785765 has 12 divisors (see below), whose sum is σ = 52739837484132. Its totient is φ = 33466176606720.

The previous prime is 42878538785699. The next prime is 42878538785891. The reversal of 42878538785765 is 56758783587824.

It can be written as a sum of positive squares in 6 ways, for example, as 10111420583716 + 32767118202049 = 3179846^2 + 5724257^2 .

It is a de Polignac number, because none of the positive numbers 2^k-42878538785765 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2550767252 + ... + 2550784061.

It is an arithmetic number, because the mean of its divisors is an integer number (4394986457011).

Almost surely, 2^{42878538785765} is an apocalyptic number.

It is an amenable number.

42878538785765 is a deficient number, since it is larger than the sum of its proper divisors (9861298698367).

42878538785765 is an equidigital number, since it uses as much as digits as its factorization.

42878538785765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101551400 (or 5101551359 counting only the distinct ones).

The product of its digits is 25288704000, while the sum is 83.

The spelling of 42878538785765 in words is "forty-two trillion, eight hundred seventy-eight billion, five hundred thirty-eight million, seven hundred eighty-five thousand, seven hundred sixty-five".