1665530555 has 32 divisors (see below), whose sum is σ = 2193887808. Its totient is φ = 1206374400.

The previous prime is 1665530549. The next prime is 1665530563. The reversal of 1665530555 is 5550355661.

It is not a de Polignac number, because 1665530555 - 2¹⁸ = 1665268411 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1223075 + ... + 1224435.

It is an arithmetic number, because the mean of its divisors is an integer number (68558994).

Almost surely, 2^1665530555 is an apocalyptic number.

1665530555 is a deficient number, since it is larger than the sum of its proper divisors (528357253).

1665530555 is a wasteful number, since it uses less digits than its factorization.

1665530555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1727.

The product of its (nonzero) digits is 337500, while the sum is 41.

The square root of 1665530555 is about 40810.9122049483. The cubic root of 1665530555 is about 1185.3616383940.

The spelling of 1665530555 in words is "one billion, six hundred sixty-five million, five hundred thirty thousand, five hundred fifty-five".