1605006660 has 48 divisors (see below), whose sum is σ = 4550918400. Its totient is φ = 422582784.

The previous prime is 1605006659. The next prime is 1605006661. The reversal of 1605006660 is 666005061.

It is an interprime number because it is at equal distance from previous prime (1605006659) and next prime (1605006661).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1605006661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 164565 + ... + 174044.

It is an arithmetic number, because the mean of its divisors is an integer number (94810800).

Almost surely, 2^1605006660 is an apocalyptic number.

1605006660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605006660 is an abundant number, since it is smaller than the sum of its proper divisors (2945911740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605006660 is a wasteful number, since it uses less digits than its factorization.

1605006660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338700 (or 338698 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 1605006660 is about 40062.5343681600. The cubic root of 1605006660 is about 1170.8257885587.

The spelling of 1605006660 in words is "one billion, six hundred five million, six thousand, six hundred sixty".