1659908989 has 8 divisors (see below), whose sum is σ = 1807524000. Its totient is φ = 1518319152.

The previous prime is 1659908959. The next prime is 1659909079. The reversal of 1659908989 is 9898099561.

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

It is a cyclic number.

It is not a de Polignac number, because 1659908989 - 2²⁷ = 1525691261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1659908989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659908959) 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 7 ways as a sum of consecutive naturals, for example, 1505719 + ... + 1506820.

It is an arithmetic number, because the mean of its divisors is an integer number (225940500).

Almost surely, 2^1659908989 is an apocalyptic number.

1659908989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1659908989 is a deficient number, since it is larger than the sum of its proper divisors (147615011).

1659908989 is a wasteful number, since it uses less digits than its factorization.

1659908989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012587.

The product of its (nonzero) digits is 12597120, while the sum is 64.

The square root of 1659908989 is about 40741.9806710474. The cubic root of 1659908989 is about 1184.0265083109.

The spelling of 1659908989 in words is "one billion, six hundred fifty-nine million, nine hundred eight thousand, nine hundred eighty-nine".