1659803649 has 16 divisors (see below), whose sum is σ = 2530375680. Its totient is φ = 948027600.

The previous prime is 1659803647. The next prime is 1659803669. The reversal of 1659803649 is 9463089561.

It is not a de Polignac number, because 1659803649 - 2¹ = 1659803647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1659803641) 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 15 ways as a sum of consecutive naturals, for example, 32562 + ... + 66180.

It is an arithmetic number, because the mean of its divisors is an integer number (158148480).

Almost surely, 2^1659803649 is an apocalyptic number.

It is an amenable number.

1659803649 is a deficient number, since it is larger than the sum of its proper divisors (870572031).

1659803649 is a wasteful number, since it uses less digits than its factorization.

1659803649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35980.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 1659803649 is about 40740.6878807906. The cubic root of 1659803649 is about 1184.0014611564.

The spelling of 1659803649 in words is "one billion, six hundred fifty-nine million, eight hundred three thousand, six hundred forty-nine".