1071665065 has 8 divisors (see below), whose sum is σ = 1290780360. Its totient is φ = 854143872.

The previous prime is 1071665053. The next prime is 1071665069. The reversal of 1071665065 is 5605661701.

It can be written as a sum of positive squares in 4 ways, for example, as 51437584 + 1020227481 = 7172^2 + 31941^2 .

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 1071665065 - 2¹⁵ = 1071632297 is a prime.

It is a super-2 number, since 2×1071665065² = 2296932023082908450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1071665069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397044 + ... + 399733.

It is an arithmetic number, because the mean of its divisors is an integer number (161347545).

Almost surely, 2^1071665065 is an apocalyptic number.

It is an amenable number.

1071665065 is a deficient number, since it is larger than the sum of its proper divisors (219115295).

1071665065 is an equidigital number, since it uses as much as digits as its factorization.

1071665065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797051.

The product of its (nonzero) digits is 37800, while the sum is 37.

The square root of 1071665065 is about 32736.2958350513. The cubic root of 1071665065 is about 1023.3393900078.

The spelling of 1071665065 in words is "one billion, seventy-one million, six hundred sixty-five thousand, sixty-five".