1984864684891 has 48 divisors (see below), whose sum is σ = 2292601651200. Its totient is φ = 1715035608000.

The previous prime is 1984864684889. The next prime is 1984864684961.

1984864684891 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1984864684891 - 2¹ = 1984864684889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984864684861) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56581305 + ... + 56616373.

It is an arithmetic number, because the mean of its divisors is an integer number (47762534400).

Almost surely, 2^{1984864684891} is an apocalyptic number.

1984864684891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1984864684891 is a deficient number, since it is larger than the sum of its proper divisors (307736966309).

1984864684891 is a wasteful number, since it uses less digits than its factorization.

1984864684891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35392 (or 35381 counting only the distinct ones).

The product of its digits is 764411904, while the sum is 76.

The spelling of 1984864684891 in words is "one trillion, nine hundred eighty-four billion, eight hundred sixty-four million, six hundred eighty-four thousand, eight hundred ninety-one".