1061661065 has 4 divisors (see below), whose sum is σ = 1273993284. Its totient is φ = 849328848.

The previous prime is 1061661047. The next prime is 1061661077. The reversal of 1061661065 is 5601661601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213861376 + 847799689 = 14624^2 + 29117^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061661065 - 2⁶ = 1061661001 is a prime.

It is a super-2 number, since 2×1061661065² = 2254248433873868450, which contains 22 as substring.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 106166102 + ... + 106166111.

It is an arithmetic number, because the mean of its divisors is an integer number (318498321).

Almost surely, 2^1061661065 is an apocalyptic number.

It is an amenable number.

1061661065 is a deficient number, since it is larger than the sum of its proper divisors (212332219).

1061661065 is an equidigital number, since it uses as much as digits as its factorization.

1061661065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212332218.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1061661065 is about 32583.1408093204. The cubic root of 1061661065 is about 1020.1451366587.

The spelling of 1061661065 in words is "one billion, sixty-one million, six hundred sixty-one thousand, sixty-five".