1065006661 has 2 divisors, whose sum is σ = 1065006662. Its totient is φ = 1065006660.

The previous prime is 1065006653. The next prime is 1065006689. The reversal of 1065006661 is 1666005601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 566154436 + 498852225 = 23794^2 + 22335^2 .

It is a cyclic number.

It is not a de Polignac number, because 1065006661 - 2³ = 1065006653 is a prime.

It is a super-2 number, since 2×1065006661² = 2268478375948737842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1065066661) 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 as a sum of consecutive naturals, namely, 532503330 + 532503331.

It is an arithmetic number, because the mean of its divisors is an integer number (532503331).

Almost surely, 2^1065006661 is an apocalyptic number.

It is an amenable number.

1065006661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1065006661 is an equidigital number, since it uses as much as digits as its factorization.

1065006661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 1065006661 is about 32634.4397990834. The cubic root of 1065006661 is about 1021.2156021647.

The spelling of 1065006661 in words is "one billion, sixty-five million, six thousand, six hundred sixty-one".