1065666661 has 8 divisors (see below), whose sum is σ = 1123657920. Its totient is φ = 1007865792.

The previous prime is 1065666653. The next prime is 1065666671. The reversal of 1065666661 is 1666665601.

1065666661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1065666661 - 2³ = 1065666653 is a prime.

It is a super-2 number, since 2×1065666661² = 2271290864733777842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065666611) 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, 36025 + ... + 58558.

It is an arithmetic number, because the mean of its divisors is an integer number (140457240).

Almost surely, 2^1065666661 is an apocalyptic number.

It is an amenable number.

1065666661 is a deficient number, since it is larger than the sum of its proper divisors (57991259).

1065666661 is an equidigital number, since it uses as much as digits as its factorization.

1065666661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95195.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 1065666661 is about 32644.5502496205. The cubic root of 1065666661 is about 1021.4265126189.

The spelling of 1065666661 in words is "one billion, sixty-five million, six hundred sixty-six thousand, six hundred sixty-one".