1066642505 has 4 divisors (see below), whose sum is σ = 1279971012. Its totient is φ = 853314000.

The previous prime is 1066642459. The next prime is 1066642519. The reversal of 1066642505 is 5052466601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 310887424 + 755755081 = 17632^2 + 27491^2 .

It is not a de Polignac number, because 1066642505 - 2⁸ = 1066642249 is a prime.

It is a super-2 number, since 2×1066642505² = 2275452466945350050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106664246 + ... + 106664255.

It is an arithmetic number, because the mean of its divisors is an integer number (319992753).

Almost surely, 2^1066642505 is an apocalyptic number.

It is an amenable number.

1066642505 is a deficient number, since it is larger than the sum of its proper divisors (213328507).

1066642505 is an equidigital number, since it uses as much as digits as its factorization.

1066642505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213328506.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 1066642505 is about 32659.4933365476. The cubic root of 1066642505 is about 1021.7381950860.

The spelling of 1066642505 in words is "one billion, sixty-six million, six hundred forty-two thousand, five hundred five".