7686662509 has 2 divisors, whose sum is σ = 7686662510. Its totient is φ = 7686662508.

The previous prime is 7686662479. The next prime is 7686662513. The reversal of 7686662509 is 9052666867.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7595994025 + 90668484 = 87155^2 + 9522^2 .

It is a cyclic number.

It is not a de Polignac number, because 7686662509 - 2¹³ = 7686654317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7686662509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7686662549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843331254 + 3843331255.

It is an arithmetic number, because the mean of its divisors is an integer number (3843331255).

Almost surely, 2^7686662509 is an apocalyptic number.

It is an amenable number.

7686662509 is a deficient number, since it is larger than the sum of its proper divisors (1).

7686662509 is an equidigital number, since it uses as much as digits as its factorization.

7686662509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The square root of 7686662509 is about 87673.6135276743. The cubic root of 7686662509 is about 1973.5400209577.

The spelling of 7686662509 in words is "seven billion, six hundred eighty-six million, six hundred sixty-two thousand, five hundred nine".