2801709665 has 16 divisors (see below), whose sum is σ = 3381073488. Its totient is φ = 2228714496.

The previous prime is 2801709653. The next prime is 2801709709. The reversal of 2801709665 is 5669071082.

It can be written as a sum of positive squares in 8 ways, for example, as 1362569569 + 1439140096 = 36913^2 + 37936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2801709665 - 2¹⁶ = 2801644129 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1300229 + ... + 1302381.

It is an arithmetic number, because the mean of its divisors is an integer number (211317093).

Almost surely, 2^2801709665 is an apocalyptic number.

It is an amenable number.

2801709665 is a deficient number, since it is larger than the sum of its proper divisors (579363823).

2801709665 is a wasteful number, since it uses less digits than its factorization.

2801709665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3508.

The product of its (nonzero) digits is 181440, while the sum is 44.

The square root of 2801709665 is about 52931.1785718021. The cubic root of 2801709665 is about 1409.7465575693.

The spelling of 2801709665 in words is "two billion, eight hundred one million, seven hundred nine thousand, six hundred sixty-five".