42505383818 has 12 divisors (see below), whose sum is σ = 66650693298. Its totient is φ = 20328661320.

The previous prime is 42505383779. The next prime is 42505383859. The reversal of 42505383818 is 81838350524.

42505383818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 30322301689 + 12183082129 = 174133^2 + 110377^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20086553 + ... + 20088668.

Almost surely, 2^42505383818 is an apocalyptic number.

42505383818 is a deficient number, since it is larger than the sum of its proper divisors (24145309480).

42505383818 is a wasteful number, since it uses less digits than its factorization.

42505383818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40175269 (or 40175246 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 42505383818 in words is "forty-two billion, five hundred five million, three hundred eighty-three thousand, eight hundred eighteen".