1608146665 has 4 divisors (see below), whose sum is σ = 1929776004. Its totient is φ = 1286517328.

The previous prime is 1608146647. The next prime is 1608146717. The reversal of 1608146665 is 5666418061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5666418061 = 1663 ⋅3407347.

It can be written as a sum of positive squares in 2 ways, for example, as 1249763904 + 358382761 = 35352^2 + 18931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1608146665 - 2²³ = 1599758057 is a prime.

It is a super-2 number, since 2×1608146665² = 5172271392301244450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160814662 + ... + 160814671.

It is an arithmetic number, because the mean of its divisors is an integer number (482444001).

Almost surely, 2^1608146665 is an apocalyptic number.

It is an amenable number.

1608146665 is a deficient number, since it is larger than the sum of its proper divisors (321629339).

1608146665 is an equidigital number, since it uses as much as digits as its factorization.

1608146665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321629338.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 1608146665 is about 40101.7040161637. The cubic root of 1608146665 is about 1171.5888184046.

The spelling of 1608146665 in words is "one billion, six hundred eight million, one hundred forty-six thousand, six hundred sixty-five".