1606551005 has 4 divisors (see below), whose sum is σ = 1927861212. Its totient is φ = 1285240800.

The previous prime is 1606550987. The next prime is 1606551029. The reversal of 1606551005 is 5001556061.

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 654643396 + 951907609 = 25586^2 + 30853^2 .

It is not a de Polignac number, because 1606551005 - 2⁸ = 1606550749 is a prime.

It is a super-2 number, since 2×1606551005² = 5162012263333020050, which contains 22 as substring.

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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160655096 + ... + 160655105.

It is an arithmetic number, because the mean of its divisors is an integer number (481965303).

Almost surely, 2^1606551005 is an apocalyptic number.

It is an amenable number.

1606551005 is a deficient number, since it is larger than the sum of its proper divisors (321310207).

1606551005 is an equidigital number, since it uses as much as digits as its factorization.

1606551005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321310206.

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 1606551005 is about 40081.8039139957. The cubic root of 1606551005 is about 1171.2011928831.

The spelling of 1606551005 in words is "one billion, six hundred six million, five hundred fifty-one thousand, five".