1665316736 has 64 divisors (see below), whose sum is σ = 3552660000. Its totient is φ = 774782976.

The previous prime is 1665316733. The next prime is 1665316739. The reversal of 1665316736 is 6376135661.

It is an interprime number because it is at equal distance from previous prime (1665316733) and next prime (1665316739).

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665316733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189365 + ... + 197963.

Almost surely, 2^1665316736 is an apocalyptic number.

1665316736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1665316736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1776330000).

1665316736 is an abundant number, since it is smaller than the sum of its proper divisors (1887343264).

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

1665316736 is an equidigital number, since it uses as much as digits as its factorization.

1665316736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8719 (or 8707 counting only the distinct ones).

The product of its digits is 408240, while the sum is 44.

The square root of 1665316736 is about 40808.2924906201. The cubic root of 1665316736 is about 1185.3109110775.

The spelling of 1665316736 in words is "one billion, six hundred sixty-five million, three hundred sixteen thousand, seven hundred thirty-six".