1288170665 has 32 divisors (see below), whose sum is σ = 1664076960. Its totient is φ = 953856000.

The previous prime is 1288170649. The next prime is 1288170701. The reversal of 1288170665 is 5660718821.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 131354521 + 1156816144 = 11461^2 + 34012^2 .

It is not a de Polignac number, because 1288170665 - 2⁴ = 1288170649 is a prime.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1553471 + ... + 1554299.

It is an arithmetic number, because the mean of its divisors is an integer number (52002405).

Almost surely, 2^1288170665 is an apocalyptic number.

It is an amenable number.

1288170665 is a deficient number, since it is larger than the sum of its proper divisors (375906295).

1288170665 is a wasteful number, since it uses less digits than its factorization.

1288170665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 1288170665 is about 35891.0945082481. The cubic root of 1288170665 is about 1088.0724187779.

The spelling of 1288170665 in words is "one billion, two hundred eighty-eight million, one hundred seventy thousand, six hundred sixty-five".