3805786661 has 2 divisors, whose sum is σ = 3805786662. Its totient is φ = 3805786660.

The previous prime is 3805786639. The next prime is 3805786693. The reversal of 3805786661 is 1666875083.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2550856036 + 1254930625 = 50506^2 + 35425^2 .

It is an emirp because it is prime and its reverse (1666875083) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3805786661 - 2²² = 3801592357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3805782661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1902893330 + 1902893331.

It is an arithmetic number, because the mean of its divisors is an integer number (1902893331).

Almost surely, 2^3805786661 is an apocalyptic number.

It is an amenable number.

3805786661 is a deficient number, since it is larger than the sum of its proper divisors (1).

3805786661 is an equidigital number, since it uses as much as digits as its factorization.

3805786661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 3805786661 is about 61691.0581932260. The cubic root of 3805786661 is about 1561.2824569519.

The spelling of 3805786661 in words is "three billion, eight hundred five million, seven hundred eighty-six thousand, six hundred sixty-one".