1606506565 has 8 divisors (see below), whose sum is σ = 1930809888. Its totient is φ = 1283203920.

The previous prime is 1606506541. The next prime is 1606506569. The reversal of 1606506565 is 5656056061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1606506565 - 2⁷ = 1606506437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606506569) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246631 + ... + 253060.

It is an arithmetic number, because the mean of its divisors is an integer number (241351236).

Almost surely, 2^1606506565 is an apocalyptic number.

It is an amenable number.

1606506565 is a deficient number, since it is larger than the sum of its proper divisors (324303323).

1606506565 is an equidigital number, since it uses as much as digits as its factorization.

1606506565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500339.

The product of its (nonzero) digits is 162000, while the sum is 40.

The square root of 1606506565 is about 40081.2495438952. The cubic root of 1606506565 is about 1171.1903936283.

The spelling of 1606506565 in words is "one billion, six hundred six million, five hundred six thousand, five hundred sixty-five".