1018338787505 has 16 divisors (see below), whose sum is σ = 1316046046224. Its totient is φ = 751981743360.

The previous prime is 1018338787483. The next prime is 1018338787541. The reversal of 1018338787505 is 5057878338101.

It can be written as a sum of positive squares in 8 ways, for example, as 87839326129 + 930499461376 = 296377^2 + 964624^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1018338787505 is a prime.

It is a super-2 number, since 2×1018338787505² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 2167595 + ... + 2595215.

It is an arithmetic number, because the mean of its divisors is an integer number (82252877889).

Almost surely, 2^{1018338787505} is an apocalyptic number.

It is an amenable number.

1018338787505 is a deficient number, since it is larger than the sum of its proper divisors (297707258719).

1018338787505 is a wasteful number, since it uses less digits than its factorization.

1018338787505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464276.

The product of its (nonzero) digits is 5644800, while the sum is 56.

The spelling of 1018338787505 in words is "one trillion, eighteen billion, three hundred thirty-eight million, seven hundred eighty-seven thousand, five hundred five".