1998395284995 has 64 divisors (see below), whose sum is σ = 3638492472960. Its totient is φ = 1040282320896.

The previous prime is 1998395284993. The next prime is 1998395285039. The reversal of 1998395284995 is 5994825938991.

1998395284995 is a `hidden beast` number, since 1 + 9 + 9 + 83 + 9 + 528 + 4 + 9 + 9 + 5 = 666.

It is not a de Polignac number, because 1998395284995 - 2¹ = 1998395284993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998395284993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 657339 + ... + 2104491.

It is an arithmetic number, because the mean of its divisors is an integer number (56851444890).

Almost surely, 2^{1998395284995} is an apocalyptic number.

1998395284995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1998395284995 is a deficient number, since it is larger than the sum of its proper divisors (1640097187965).

1998395284995 is a wasteful number, since it uses less digits than its factorization.

1998395284995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447413 (or 1447407 counting only the distinct ones).

The product of its digits is 2267481600, while the sum is 81.

The spelling of 1998395284995 in words is "one trillion, nine hundred ninety-eight billion, three hundred ninety-five million, two hundred eighty-four thousand, nine hundred ninety-five".