1665265543 has 2 divisors, whose sum is σ = 1665265544. Its totient is φ = 1665265542.

The previous prime is 1665265531. The next prime is 1665265577. The reversal of 1665265543 is 3455625661.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665265543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665265543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665265513) 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 as a sum of consecutive naturals, namely, 832632771 + 832632772.

It is an arithmetic number, because the mean of its divisors is an integer number (832632772).

Almost surely, 2^1665265543 is an apocalyptic number.

1665265543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665265543 is an equidigital number, since it uses as much as digits as its factorization.

1665265543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 43.

The square root of 1665265543 is about 40807.6652480879. The cubic root of 1665265543 is about 1185.2987651912.

The spelling of 1665265543 in words is "one billion, six hundred sixty-five million, two hundred sixty-five thousand, five hundred forty-three".