7658716661 has 2 divisors, whose sum is σ = 7658716662. Its totient is φ = 7658716660.

The previous prime is 7658716621. The next prime is 7658716673. The reversal of 7658716661 is 1666178567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6728100625 + 930616036 = 82025^2 + 30506^2 .

It is an emirp because it is prime and its reverse (1666178567) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7658716661 - 2²⁶ = 7591607797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7658716621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3829358330 + 3829358331.

It is an arithmetic number, because the mean of its divisors is an integer number (3829358331).

Almost surely, 2^7658716661 is an apocalyptic number.

It is an amenable number.

7658716661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7658716661 is an equidigital number, since it uses as much as digits as its factorization.

7658716661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 53.

The square root of 7658716661 is about 87514.0940706124. The cubic root of 7658716661 is about 1971.1454306570.

The spelling of 7658716661 in words is "seven billion, six hundred fifty-eight million, seven hundred sixteen thousand, six hundred sixty-one".