1888444878849 has 9 divisors (see below), whose sum is σ = 2727759668803. Its totient is φ = 1258960504152.

The previous prime is 1888444878811. The next prime is 1888444878857. The reversal of 1888444878849 is 9488784448881.

The square root of 1888444878849 is 1374207.

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

1888444878849 is a `hidden beast` number, since 18 + 8 + 8 + 4 + 4 + 487 + 88 + 49 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2382123249 + 1886062755600 = 48807^2 + 1373340^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1888444878849 - 2⁷ = 1888444878721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1888444878049) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3893587 + ... + 4351655.

Almost surely, 2^{1888444878849} is an apocalyptic number.

1888444878849 is the 1374207-th square number.

1888444878849 is the 687104-th centered octagonal number.

It is an amenable number.

1888444878849 is a deficient number, since it is larger than the sum of its proper divisors (839314789954).

1888444878849 is an frugal number, since it uses more digits than its factorization.

1888444878849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916144 (or 458072 counting only the distinct ones).

The product of its digits is 4227858432, while the sum is 81.

Multiplying 1888444878849 by its sum of digits (81), we get a square (152964035186769 = 12367863²).

The spelling of 1888444878849 in words is "one trillion, eight hundred eighty-eight billion, four hundred forty-four million, eight hundred seventy-eight thousand, eight hundred forty-nine".