1011665665 has 8 divisors (see below), whose sum is σ = 1285410600. Its totient is φ = 761724672.

The previous prime is 1011665651. The next prime is 1011665701. The reversal of 1011665665 is 5665661101.

It can be written as a sum of positive squares in 4 ways, for example, as 11082241 + 1000583424 = 3329^2 + 31632^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1011665665 - 2¹¹ = 1011663617 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5950890 + ... + 5951059.

It is an arithmetic number, because the mean of its divisors is an integer number (160676325).

Almost surely, 2^1011665665 is an apocalyptic number.

It is an amenable number.

1011665665 is a deficient number, since it is larger than the sum of its proper divisors (273744935).

1011665665 is a wasteful number, since it uses less digits than its factorization.

1011665665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11901971.

The product of its (nonzero) digits is 32400, while the sum is 37.

The square root of 1011665665 is about 31806.6921417490. The cubic root of 1011665665 is about 1003.8735313815.

The spelling of 1011665665 in words is "one billion, eleven million, six hundred sixty-five thousand, six hundred sixty-five".