1665015563 has 16 divisors (see below), whose sum is σ = 1758908736. Its totient is φ = 1573017600.

The previous prime is 1665015481. The next prime is 1665015587. The reversal of 1665015563 is 3655105661.

It is a cyclic number.

It is not a de Polignac number, because 1665015563 - 2⁸ = 1665015307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1665014563) 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, 874913 + ... + 876813.

It is an arithmetic number, because the mean of its divisors is an integer number (109931796).

Almost surely, 2^1665015563 is an apocalyptic number.

1665015563 is a deficient number, since it is larger than the sum of its proper divisors (93893173).

1665015563 is a wasteful number, since it uses less digits than its factorization.

1665015563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2374.

The product of its (nonzero) digits is 81000, while the sum is 38.

The square root of 1665015563 is about 40804.6022281801. The cubic root of 1665015563 is about 1185.2394521657.

The spelling of 1665015563 in words is "one billion, six hundred sixty-five million, fifteen thousand, five hundred sixty-three".