1066450405 has 4 divisors (see below), whose sum is σ = 1279740492. Its totient is φ = 853160320.

The previous prime is 1066450391. The next prime is 1066450423. The reversal of 1066450405 is 5040546601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5040546601 = 41 ⋅122940161.

It can be written as a sum of positive squares in 2 ways, for example, as 719634276 + 346816129 = 26826^2 + 18623^2 .

It is not a de Polignac number, because 1066450405 - 2²⁵ = 1032895973 is a prime.

It is a super-2 number, since 2×1066450405² = 2274632932649328050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 106645036 + ... + 106645045.

It is an arithmetic number, because the mean of its divisors is an integer number (319935123).

Almost surely, 2^1066450405 is an apocalyptic number.

It is an amenable number.

1066450405 is a deficient number, since it is larger than the sum of its proper divisors (213290087).

1066450405 is an equidigital number, since it uses as much as digits as its factorization.

1066450405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213290086.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 1066450405 is about 32656.5522521898. The cubic root of 1066450405 is about 1021.6768537930.

The spelling of 1066450405 in words is "one billion, sixty-six million, four hundred fifty thousand, four hundred five".