1649659705 has 16 divisors (see below), whose sum is σ = 2174382720. Its totient is φ = 1195907328.

The previous prime is 1649659703. The next prime is 1649659717. The reversal of 1649659705 is 5079569461.

It is a cyclic number.

It is not a de Polignac number, because 1649659705 - 2¹ = 1649659703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1649659703) 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 15 ways as a sum of consecutive naturals, for example, 375312 + ... + 379681.

It is an arithmetic number, because the mean of its divisors is an integer number (135898920).

Almost surely, 2^1649659705 is an apocalyptic number.

It is an amenable number.

1649659705 is a deficient number, since it is larger than the sum of its proper divisors (524723015).

1649659705 is a wasteful number, since it uses less digits than its factorization.

1649659705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755040.

The product of its (nonzero) digits is 2041200, while the sum is 52.

The square root of 1649659705 is about 40616.0030652943. The cubic root of 1649659705 is about 1181.5845095395.

The spelling of 1649659705 in words is "one billion, six hundred forty-nine million, six hundred fifty-nine thousand, seven hundred five".