1066645165 has 4 divisors (see below), whose sum is σ = 1279974204. Its totient is φ = 853316128.

The previous prime is 1066645157. The next prime is 1066645169. The reversal of 1066645165 is 5615466601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5615466601 = 5519 ⋅1017479.

It can be written as a sum of positive squares in 2 ways, for example, as 608214244 + 458430921 = 24662^2 + 21411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1066645165 - 2³ = 1066645157 is a prime.

It is a super-2 number, since 2×1066645165² = 2275463816035754450, 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 (1066645169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106664512 + ... + 106664521.

It is an arithmetic number, because the mean of its divisors is an integer number (319993551).

Almost surely, 2^1066645165 is an apocalyptic number.

It is an amenable number.

1066645165 is a deficient number, since it is larger than the sum of its proper divisors (213329039).

1066645165 is an equidigital number, since it uses as much as digits as its factorization.

1066645165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213329038.

The product of its (nonzero) digits is 129600, while the sum is 40.

The square root of 1066645165 is about 32659.5340597505. The cubic root of 1066645165 is about 1021.7390444244.

The spelling of 1066645165 in words is "one billion, sixty-six million, six hundred forty-five thousand, one hundred sixty-five".