1998568461 has 8 divisors (see below), whose sum is σ = 2678565760. Its totient is φ = 1325475072.

The previous prime is 1998568459. The next prime is 1998568477. The reversal of 1998568461 is 1648658991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998568461 - 2¹ = 1998568459 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998568441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1725301 + ... + 1726458.

It is an arithmetic number, because the mean of its divisors is an integer number (334820720).

Almost surely, 2^1998568461 is an apocalyptic number.

It is an amenable number.

1998568461 is a deficient number, since it is larger than the sum of its proper divisors (679997299).

1998568461 is a wasteful number, since it uses less digits than its factorization.

1998568461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3451955.

The product of its digits is 3732480, while the sum is 57.

The square root of 1998568461 is about 44705.3515923989. The cubic root of 1998568461 is about 1259.6203737919.

The spelling of 1998568461 in words is "one billion, nine hundred ninety-eight million, five hundred sixty-eight thousand, four hundred sixty-one".