1665316733 has 2 divisors, whose sum is σ = 1665316734. Its totient is φ = 1665316732.

The previous prime is 1665316729. The next prime is 1665316739. The reversal of 1665316733 is 3376135661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1299818809 + 365497924 = 36053^2 + 19118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1665316733 - 2² = 1665316729 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665316739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832658366 + 832658367.

It is an arithmetic number, because the mean of its divisors is an integer number (832658367).

Almost surely, 2^1665316733 is an apocalyptic number.

It is an amenable number.

1665316733 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665316733 is an equidigital number, since it uses as much as digits as its factorization.

1665316733 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 41.

The square root of 1665316733 is about 40808.2924538629. The cubic root of 1665316733 is about 1185.3109103657.

The spelling of 1665316733 in words is "one billion, six hundred sixty-five million, three hundred sixteen thousand, seven hundred thirty-three".