1662535989 has 8 divisors (see below), whose sum is σ = 2463016320. Its totient is φ = 1108357308.

The previous prime is 1662535951. The next prime is 1662535999. The reversal of 1662535989 is 9895352661.

It is a happy number.

1662535989 is a `hidden beast` number, since 1 + 6 + 625 + 3 + 5 + 9 + 8 + 9 = 666.

It is not a de Polignac number, because 1662535989 - 2¹⁵ = 1662503221 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1662535999) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30787677 + ... + 30787730.

It is an arithmetic number, because the mean of its divisors is an integer number (307877040).

Almost surely, 2^1662535989 is an apocalyptic number.

It is an amenable number.

1662535989 is a deficient number, since it is larger than the sum of its proper divisors (800480331).

1662535989 is an equidigital number, since it uses as much as digits as its factorization.

1662535989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61575416 (or 61575410 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 54.

The square root of 1662535989 is about 40774.2073987956. The cubic root of 1662535989 is about 1184.6507992052.

The spelling of 1662535989 in words is "one billion, six hundred sixty-two million, five hundred thirty-five thousand, nine hundred eighty-nine".