1066644165 has 16 divisors (see below), whose sum is σ = 1707826176. Its totient is φ = 568478400.

The previous prime is 1066644149. The next prime is 1066644167. The reversal of 1066644165 is 5614466601.

It is a happy number.

It is not a de Polignac number, because 1066644165 - 2⁴ = 1066644149 is a prime.

It is a super-2 number, since 2×1066644165² = 2275459549457094450, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1066644167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2106 + ... + 46235.

It is an arithmetic number, because the mean of its divisors is an integer number (106739136).

Almost surely, 2^1066644165 is an apocalyptic number.

1066644165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1066644165 is a deficient number, since it is larger than the sum of its proper divisors (641182011).

1066644165 is a wasteful number, since it uses less digits than its factorization.

1066644165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49820.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 1066644165 is about 32659.5187502817. The cubic root of 1066644165 is about 1021.7387251245.

The spelling of 1066644165 in words is "one billion, sixty-six million, six hundred forty-four thousand, one hundred sixty-five".