1665677516843 has 2 divisors, whose sum is σ = 1665677516844. Its totient is φ = 1665677516842.

The previous prime is 1665677516809. The next prime is 1665677516981. The reversal of 1665677516843 is 3486157765661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665677516843 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1665677516843.

It is not a weakly prime, because it can be changed into another prime (1665677516143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832838758421 + 832838758422.

It is an arithmetic number, because the mean of its divisors is an integer number (832838758422).

Almost surely, 2^{1665677516843} is an apocalyptic number.

1665677516843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665677516843 is an equidigital number, since it uses as much as digits as its factorization.

1665677516843 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 152409600, while the sum is 65.

The spelling of 1665677516843 in words is "one trillion, six hundred sixty-five billion, six hundred seventy-seven million, five hundred sixteen thousand, eight hundred forty-three".