661105763 has 2 divisors, whose sum is σ = 661105764. Its totient is φ = 661105762.

The previous prime is 661105747. The next prime is 661105777. The reversal of 661105763 is 367501166.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 661105763 - 2⁴ = 661105747 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (661105723) 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, 330552881 + 330552882.

It is an arithmetic number, because the mean of its divisors is an integer number (330552882).

Almost surely, 2^661105763 is an apocalyptic number.

661105763 is a deficient number, since it is larger than the sum of its proper divisors (1).

661105763 is an equidigital number, since it uses as much as digits as its factorization.

661105763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 661105763 is about 25711.9770340594. The cubic root of 661105763 is about 871.1447312858.

The spelling of 661105763 in words is "six hundred sixty-one million, one hundred five thousand, seven hundred sixty-three".