7761661 has 2 divisors, whose sum is σ = 7761662. Its totient is φ = 7761660.

The previous prime is 7761643. The next prime is 7761679. The reversal of 7761661 is 1661677.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (7761643) and next prime (7761679).

It can be written as a sum of positive squares in only one way, i.e., 6859161 + 902500 = 2619^2 + 950^2 .

It is an emirp because it is prime and its reverse (1661677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7761661 - 2¹⁷ = 7630589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7761361) 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, 3880830 + 3880831.

It is an arithmetic number, because the mean of its divisors is an integer number (3880831).

Almost surely, 2^7761661 is an apocalyptic number.

It is an amenable number.

7761661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7761661 is an equidigital number, since it uses as much as digits as its factorization.

7761661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10584, while the sum is 34.

The square root of 7761661 is about 2785.9757716104. The cubic root of 7761661 is about 197.9937844527.

It can be divided in two parts, 77616 and 61, that added together give a palindrome (77677).

The spelling of 7761661 in words is "seven million, seven hundred sixty-one thousand, six hundred sixty-one".