18143408402065 has 32 divisors (see below), whose sum is σ = 23145448500000. Its totient is φ = 13627279669248.

The previous prime is 18143408402059. The next prime is 18143408402081. The reversal of 18143408402065 is 56020480434181.

It is a Cunningham number, because it is equal to 4259508²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 3273754659904 + 14869653742161 = 1809352^2 + 3856119^2 .

It is a cyclic number.

It is not a de Polignac number, because 18143408402065 - 2¹⁷ = 18143408270993 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 7941061 + ... + 9967309.

It is an arithmetic number, because the mean of its divisors is an integer number (723295265625).

Almost surely, 2^{18143408402065} is an apocalyptic number.

It is an amenable number.

18143408402065 is a deficient number, since it is larger than the sum of its proper divisors (5002040097935).

18143408402065 is a wasteful number, since it uses less digits than its factorization.

18143408402065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027989.

The product of its (nonzero) digits is 737280, while the sum is 46.

The spelling of 18143408402065 in words is "eighteen trillion, one hundred forty-three billion, four hundred eight million, four hundred two thousand, sixty-five".