1066406665 has 16 divisors (see below), whose sum is σ = 1351696896. Its totient is φ = 806400000.

The previous prime is 1066406611. The next prime is 1066406669. The reversal of 1066406665 is 5666046601.

It is not a de Polignac number, because 1066406665 - 2⁹ = 1066406153 is a prime.

It is a super-2 number, since 2×1066406665² = 2274446350312844450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066406669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73336 + ... + 86665.

It is an arithmetic number, because the mean of its divisors is an integer number (84481056).

Almost surely, 2^1066406665 is an apocalyptic number.

It is an amenable number.

1066406665 is a deficient number, since it is larger than the sum of its proper divisors (285290231).

1066406665 is a wasteful number, since it uses less digits than its factorization.

1066406665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160080.

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 1066406665 is about 32655.8825481719. The cubic root of 1066406665 is about 1021.6628857246.

It can be divided in two parts, 106640 and 6665, that multiplied together give a square (710755600 = 26660²).

The spelling of 1066406665 in words is "one billion, sixty-six million, four hundred six thousand, six hundred sixty-five".