1998665353 has 2 divisors, whose sum is σ = 1998665354. Its totient is φ = 1998665352.

The previous prime is 1998665303. The next prime is 1998665363. The reversal of 1998665353 is 3535668991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1888163209 + 110502144 = 43453^2 + 10512^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998665353 - 2¹⁷ = 1998534281 is a prime.

It is a super-2 number, since 2×1998665353² = 7989326386565229218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1998665294 and 1998665303.

It is not a weakly prime, because it can be changed into another prime (1998665303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999332676 + 999332677.

It is an arithmetic number, because the mean of its divisors is an integer number (999332677).

Almost surely, 2^1998665353 is an apocalyptic number.

It is an amenable number.

1998665353 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998665353 is an equidigital number, since it uses as much as digits as its factorization.

1998665353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 55.

The square root of 1998665353 is about 44706.4352526569. The cubic root of 1998665353 is about 1259.6407292225.

The spelling of 1998665353 in words is "one billion, nine hundred ninety-eight million, six hundred sixty-five thousand, three hundred fifty-three".