18638733065 has 16 divisors (see below), whose sum is σ = 22590464592. Its totient is φ = 14762352384.

The previous prime is 18638733053. The next prime is 18638733073. The reversal of 18638733065 is 56033783681.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 4560435961 + 14078297104 = 67531^2 + 118652^2 .

It is a cyclic number.

It is not a de Polignac number, because 18638733065 - 2¹⁶ = 18638667529 is a prime.

It is a Duffinian 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, 174587 + ... + 260303.

It is an arithmetic number, because the mean of its divisors is an integer number (1411904037).

Almost surely, 2^18638733065 is an apocalyptic number.

It is an amenable number.

18638733065 is a deficient number, since it is larger than the sum of its proper divisors (3951731527).

18638733065 is a wasteful number, since it uses less digits than its factorization.

18638733065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86156.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 18638733065 in words is "eighteen billion, six hundred thirty-eight million, seven hundred thirty-three thousand, sixty-five".