18994011836944 has 75 divisors (see below), whose sum is σ = 37555380141213. Its totient is φ = 9306212113536.

The previous prime is 18994011836911. The next prime is 18994011837019. The reversal of 18994011836944 is 44963811049981.

The square root of 18994011836944 is 4358212.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 121173610000 + 18872838226944 = 348100^2 + 4344288^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18994011836944.

It is an unprimeable number.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 60683743732 + ... + 60683744044.

Almost surely, 2^{18994011836944} is an apocalyptic number.

18994011836944 is the 4358212-nd square number.

It is an amenable number.

18994011836944 is a deficient number, since it is larger than the sum of its proper divisors (18561368304269).

18994011836944 is an frugal number, since it uses more digits than its factorization.

18994011836944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 67.

The spelling of 18994011836944 in words is "eighteen trillion, nine hundred ninety-four billion, eleven million, eight hundred thirty-six thousand, nine hundred forty-four".