1768351661 has 2 divisors, whose sum is σ = 1768351662. Its totient is φ = 1768351660.

The previous prime is 1768351633. The next prime is 1768351667. The reversal of 1768351661 is 1661538671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1558275625 + 210076036 = 39475^2 + 14494^2 .

It is a cyclic number.

It is not a de Polignac number, because 1768351661 - 2¹⁴ = 1768335277 is a prime.

It is a super-2 number, since 2×1768351661² = 6254135193922917842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1768351667) 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, 884175830 + 884175831.

It is an arithmetic number, because the mean of its divisors is an integer number (884175831).

Almost surely, 2^1768351661 is an apocalyptic number.

It is an amenable number.

1768351661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1768351661 is an equidigital number, since it uses as much as digits as its factorization.

1768351661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 44.

The square root of 1768351661 is about 42051.7735773415. The cubic root of 1768351661 is about 1209.2688844220.

The spelling of 1768351661 in words is "one billion, seven hundred sixty-eight million, three hundred fifty-one thousand, six hundred sixty-one".