1066559905 has 4 divisors (see below), whose sum is σ = 1279871892. Its totient is φ = 853247920.

The previous prime is 1066559873. The next prime is 1066559909. The reversal of 1066559905 is 5099556601.

It is a happy number.

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 278522721 + 788037184 = 16689^2 + 28072^2 .

It is not a de Polignac number, because 1066559905 - 2⁵ = 1066559873 is a prime.

It is a super-3 number, since 3×1066559905³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1066559909) 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, 106655986 + ... + 106655995.

It is an arithmetic number, because the mean of its divisors is an integer number (319967973).

Almost surely, 2^1066559905 is an apocalyptic number.

It is an amenable number.

1066559905 is a deficient number, since it is larger than the sum of its proper divisors (213311987).

1066559905 is an equidigital number, since it uses as much as digits as its factorization.

1066559905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213311986.

The product of its (nonzero) digits is 364500, while the sum is 46.

The square root of 1066559905 is about 32658.2287486630. The cubic root of 1066559905 is about 1021.7118201906.

The spelling of 1066559905 in words is "one billion, sixty-six million, five hundred fifty-nine thousand, nine hundred five".