1665586663 has 4 divisors (see below), whose sum is σ = 1793708728. Its totient is φ = 1537464600.

The previous prime is 1665586661. The next prime is 1665586711. The reversal of 1665586663 is 3666855661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1665586663 - 2¹ = 1665586661 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665586663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665586661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64061013 + ... + 64061038.

It is an arithmetic number, because the mean of its divisors is an integer number (448427182).

Almost surely, 2^1665586663 is an apocalyptic number.

1665586663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1665586663 is a deficient number, since it is larger than the sum of its proper divisors (128122065).

1665586663 is a wasteful number, since it uses less digits than its factorization.

1665586663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128122064.

The product of its digits is 4665600, while the sum is 52.

The square root of 1665586663 is about 40811.5996133452. The cubic root of 1665586663 is about 1185.3749489722.

The spelling of 1665586663 in words is "one billion, six hundred sixty-five million, five hundred eighty-six thousand, six hundred sixty-three".