1664419898 has 8 divisors (see below), whose sum is σ = 2498632500. Its totient is φ = 831542400.

The previous prime is 1664419879. The next prime is 1664419903. The reversal of 1664419898 is 8989144661.

It can be written as a sum of positive squares in 2 ways, for example, as 1583005369 + 81414529 = 39787^2 + 9023^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330653 + ... + 335648.

Almost surely, 2^1664419898 is an apocalyptic number.

1664419898 is a deficient number, since it is larger than the sum of its proper divisors (834212602).

1664419898 is a wasteful number, since it uses less digits than its factorization.

1664419898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667552.

The product of its digits is 2985984, while the sum is 56.

The square root of 1664419898 is about 40797.3025824012. The cubic root of 1664419898 is about 1185.0980941542.

The spelling of 1664419898 in words is "one billion, six hundred sixty-four million, four hundred nineteen thousand, eight hundred ninety-eight".