1071320665 has 8 divisors (see below), whose sum is σ = 1293016968. Its totient is φ = 852101760.

The previous prime is 1071320629. The next prime is 1071320669. The reversal of 1071320665 is 5660231701.

It can be written as a sum of positive squares in 4 ways, for example, as 387184329 + 684136336 = 19677^2 + 26156^2 .

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

It is not a de Polignac number, because 1071320665 - 2⁹ = 1071320153 is a prime.

It is a super-2 number, since 2×1071320665² = 2295455934512084450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1071320669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 618396 + ... + 620125.

It is an arithmetic number, because the mean of its divisors is an integer number (161627121).

Almost surely, 2^1071320665 is an apocalyptic number.

It is an amenable number.

1071320665 is a deficient number, since it is larger than the sum of its proper divisors (221696303).

1071320665 is a wasteful number, since it uses less digits than its factorization.

1071320665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238699.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1071320665 is about 32731.0351959726. The cubic root of 1071320665 is about 1023.2297550548.

The spelling of 1071320665 in words is "one billion, seventy-one million, three hundred twenty thousand, six hundred sixty-five".