42318451816 has 8 divisors (see below), whose sum is σ = 79347097170. Its totient is φ = 21159225904.

The previous prime is 42318451759. The next prime is 42318451823. The reversal of 42318451816 is 61815481324.

It can be written as a sum of positive squares in only one way, i.e., 39738827716 + 2579624100 = 199346^2 + 50790^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×42318451816² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2644903231 + ... + 2644903246.

Almost surely, 2^42318451816 is an apocalyptic number.

It is an amenable number.

42318451816 is a deficient number, since it is larger than the sum of its proper divisors (37028645354).

42318451816 is a wasteful number, since it uses less digits than its factorization.

42318451816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289806483 (or 5289806479 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The spelling of 42318451816 in words is "forty-two billion, three hundred eighteen million, four hundred fifty-one thousand, eight hundred sixteen".