1998850065 has 32 divisors (see below), whose sum is σ = 3370705920. Its totient is φ = 1008679104.

The previous prime is 1998850057. The next prime is 1998850067. The reversal of 1998850065 is 5600588991.

It is not a de Polignac number, because 1998850065 - 2³ = 1998850057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1998850067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248842 + ... + 256748.

It is an arithmetic number, because the mean of its divisors is an integer number (105334560).

Almost surely, 2^1998850065 is an apocalyptic number.

1998850065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1998850065 is a deficient number, since it is larger than the sum of its proper divisors (1371855855).

1998850065 is a wasteful number, since it uses less digits than its factorization.

1998850065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821.

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 1998850065 is about 44708.5010372748. The cubic root of 1998850065 is about 1259.6795323820.

The spelling of 1998850065 in words is "one billion, nine hundred ninety-eight million, eight hundred fifty thousand, sixty-five".