7686662549 has 2 divisors, whose sum is σ = 7686662550. Its totient is φ = 7686662548.

The previous prime is 7686662513. The next prime is 7686662561. The reversal of 7686662549 is 9452666867.

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., 7228060324 + 458602225 = 85018^2 + 21415^2 .

It is a cyclic number.

It is not a de Polignac number, because 7686662549 - 2⁸ = 7686662293 is a prime.

It is a super-2 number, since 2×7686662549² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7686662509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3843331274 + 3843331275.

It is an arithmetic number, because the mean of its divisors is an integer number (3843331275).

Almost surely, 2^7686662549 is an apocalyptic number.

It is an amenable number.

7686662549 is a deficient number, since it is larger than the sum of its proper divisors (1).

7686662549 is an equidigital number, since it uses as much as digits as its factorization.

7686662549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 59.

The square root of 7686662549 is about 87673.6137557931. The cubic root of 7686662549 is about 1973.5400243810.

The spelling of 7686662549 in words is "seven billion, six hundred eighty-six million, six hundred sixty-two thousand, five hundred forty-nine".