1600016665 has 16 divisors (see below), whose sum is σ = 2069499600. Its totient is φ = 1180530432.

The previous prime is 1600016617. The next prime is 1600016669. The reversal of 1600016665 is 5666100061.

It can be written as a sum of positive squares in 8 ways, for example, as 4892944 + 1595123721 = 2212^2 + 39939^2 .

It is a cyclic number.

It is not a de Polignac number, because 1600016665 - 2²⁷ = 1465798937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1600016669) 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, 69871 + ... + 89899.

It is an arithmetic number, because the mean of its divisors is an integer number (129343725).

Almost surely, 2^1600016665 is an apocalyptic number.

It is an amenable number.

1600016665 is a deficient number, since it is larger than the sum of its proper divisors (469482935).

1600016665 is a wasteful number, since it uses less digits than its factorization.

1600016665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21276.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1600016665 is about 40000.2083119576. The cubic root of 1600016665 is about 1169.6111560007.

The spelling of 1600016665 in words is "one billion, six hundred million, sixteen thousand, six hundred sixty-five".