1984155823873 has 6 divisors (see below), whose sum is σ = 2027270121986. Its totient is φ = 1941939740352.

The previous prime is 1984155823807. The next prime is 1984155823879. The reversal of 1984155823873 is 3783285514891.

It can be written as a sum of positive squares in only one way, i.e., 1442153604609 + 542002219264 = 1200897^2 + 736208^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1984155823873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984155823879) 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 5 ways as a sum of consecutive naturals, for example, 449105040 + ... + 449109457.

Almost surely, 2^{1984155823873} is an apocalyptic number.

It is an amenable number.

1984155823873 is a deficient number, since it is larger than the sum of its proper divisors (43114298113).

1984155823873 is an frugal number, since it uses more digits than its factorization.

1984155823873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898214591 (or 898214544 counting only the distinct ones).

The product of its digits is 58060800, while the sum is 64.

The spelling of 1984155823873 in words is "one trillion, nine hundred eighty-four billion, one hundred fifty-five million, eight hundred twenty-three thousand, eight hundred seventy-three".