1665316350941 has 2 divisors, whose sum is σ = 1665316350942. Its totient is φ = 1665316350940.

The previous prime is 1665316350937. The next prime is 1665316351063. The reversal of 1665316350941 is 1490536135661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1481626962841 + 183689388100 = 1217221^2 + 428590^2 .

It is an emirp because it is prime and its reverse (1490536135661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1665316350941 - 2² = 1665316350937 is a prime.

It is a super-2 number, since 2×1665316350941² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665316350941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1665316350041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832658175470 + 832658175471.

It is an arithmetic number, because the mean of its divisors is an integer number (832658175471).

Almost surely, 2^{1665316350941} is an apocalyptic number.

It is an amenable number.

1665316350941 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665316350941 is an equidigital number, since it uses as much as digits as its factorization.

1665316350941 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 1665316350941 in words is "one trillion, six hundred sixty-five billion, three hundred sixteen million, three hundred fifty thousand, nine hundred forty-one".