1665938353 has 2 divisors, whose sum is σ = 1665938354. Its totient is φ = 1665938352.

The previous prime is 1665938303. The next prime is 1665938381. The reversal of 1665938353 is 3538395661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1662029824 + 3908529 = 40768^2 + 1977^2 .

It is an emirp because it is prime and its reverse (3538395661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1665938353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1665938297 and 1665938306.

It is not a weakly prime, because it can be changed into another prime (1665938303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832969176 + 832969177.

It is an arithmetic number, because the mean of its divisors is an integer number (832969177).

Almost surely, 2^1665938353 is an apocalyptic number.

It is an amenable number.

1665938353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1665938353 is an equidigital number, since it uses as much as digits as its factorization.

1665938353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 49.

The square root of 1665938353 is about 40815.9080874112. The cubic root of 1665938353 is about 1185.4583740673.

The spelling of 1665938353 in words is "one billion, six hundred sixty-five million, nine hundred thirty-eight thousand, three hundred fifty-three".