1606424665 has 4 divisors (see below), whose sum is σ = 1927709604. Its totient is φ = 1285139728.

The previous prime is 1606424623. The next prime is 1606424689. The reversal of 1606424665 is 5664246061.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5664246061 = 1873 ⋅3024157.

It can be written as a sum of positive squares in 2 ways, for example, as 812763081 + 793661584 = 28509^2 + 28172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606424665 - 2²⁷ = 1472206937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 160642462 + ... + 160642471.

It is an arithmetic number, because the mean of its divisors is an integer number (481927401).

Almost surely, 2^1606424665 is an apocalyptic number.

It is an amenable number.

1606424665 is a deficient number, since it is larger than the sum of its proper divisors (321284939).

1606424665 is an equidigital number, since it uses as much as digits as its factorization.

1606424665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321284938.

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 1606424665 is about 40080.2278561387. The cubic root of 1606424665 is about 1171.1704907896.

The spelling of 1606424665 in words is "one billion, six hundred six million, four hundred twenty-four thousand, six hundred sixty-five".