1071506665 has 8 divisors (see below), whose sum is σ = 1289625480. Its totient is φ = 854660352.

The previous prime is 1071506641. The next prime is 1071506687. The reversal of 1071506665 is 5666051701.

It can be written as a sum of positive squares in 4 ways, for example, as 142659136 + 928847529 = 11944^2 + 30477^2 .

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 1071506665 - 2⁵ = 1071506633 is a prime.

It is a super-2 number, since 2×1071506665² = 2296253066278844450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 316270 + ... + 319639.

It is an arithmetic number, because the mean of its divisors is an integer number (161203185).

Almost surely, 2^1071506665 is an apocalyptic number.

It is an amenable number.

1071506665 is a deficient number, since it is larger than the sum of its proper divisors (218118815).

1071506665 is an equidigital number, since it uses as much as digits as its factorization.

1071506665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636251.

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

The square root of 1071506665 is about 32733.8764126707. The cubic root of 1071506665 is about 1023.2889684872.

The spelling of 1071506665 in words is "one billion, seventy-one million, five hundred six thousand, six hundred sixty-five".