7698787661 has 2 divisors, whose sum is σ = 7698787662. Its totient is φ = 7698787660.

The previous prime is 7698787627. The next prime is 7698787667. The reversal of 7698787661 is 1667878967.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7693921225 + 4866436 = 87715^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 7698787661 - 2¹⁴ = 7698771277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7698787667) 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, 3849393830 + 3849393831.

It is an arithmetic number, because the mean of its divisors is an integer number (3849393831).

Almost surely, 2^7698787661 is an apocalyptic number.

It is an amenable number.

7698787661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7698787661 is an equidigital number, since it uses as much as digits as its factorization.

7698787661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42674688, while the sum is 65.

The square root of 7698787661 is about 87742.7356594265. The cubic root of 7698787661 is about 1974.5771811636.

The spelling of 7698787661 in words is "seven billion, six hundred ninety-eight million, seven hundred eighty-seven thousand, six hundred sixty-one".