1665565716 has 24 divisors (see below), whose sum is σ = 3950031904. Its totient is φ = 546086880.

The previous prime is 1665565711. The next prime is 1665565721. The reversal of 1665565716 is 6175655661.

It is an interprime number because it is at equal distance from previous prime (1665565711) and next prime (1665565721).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665565711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1136950 + ... + 1138413.

Almost surely, 2^1665565716 is an apocalyptic number.

It is an amenable number.

1665565716 is an abundant number, since it is smaller than the sum of its proper divisors (2284466188).

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

1665565716 is a wasteful number, since it uses less digits than its factorization.

1665565716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275431 (or 2275429 counting only the distinct ones).

The product of its digits is 1134000, while the sum is 48.

The square root of 1665565716 is about 40811.3429820681. The cubic root of 1665565716 is about 1185.3699797215.

The spelling of 1665565716 in words is "one billion, six hundred sixty-five million, five hundred sixty-five thousand, seven hundred sixteen".