1918380488643 has 16 divisors (see below), whose sum is σ = 2842068336640. Its totient is φ = 1278909900072.

The previous prime is 1918380488573. The next prime is 1918380488653. The reversal of 1918380488643 is 3468840838191.

1918380488643 is a `hidden beast` number, since 1 + 9 + 18 + 3 + 80 + 488 + 64 + 3 = 666.

It is not a de Polignac number, because 1918380488643 - 2²⁶ = 1918313379779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1918380488653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4560930 + ... + 4963752.

It is an arithmetic number, because the mean of its divisors is an integer number (177629271040).

Almost surely, 2^{1918380488643} is an apocalyptic number.

1918380488643 is a deficient number, since it is larger than the sum of its proper divisors (923687847997).

1918380488643 is a wasteful number, since it uses less digits than its factorization.

1918380488643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579215 (or 579209 counting only the distinct ones).

The product of its (nonzero) digits is 31850496, while the sum is 63.

The spelling of 1918380488643 in words is "one trillion, nine hundred eighteen billion, three hundred eighty million, four hundred eighty-eight thousand, six hundred forty-three".