7678106561 has 2 divisors, whose sum is σ = 7678106562. Its totient is φ = 7678106560.

The previous prime is 7678106519. The next prime is 7678106573. The reversal of 7678106561 is 1656018767.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4911346561 + 2766760000 = 70081^2 + 52600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7678106561 is a prime.

It is not a weakly prime, because it can be changed into another prime (7678106861) 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, 3839053280 + 3839053281.

It is an arithmetic number, because the mean of its divisors is an integer number (3839053281).

Almost surely, 2^7678106561 is an apocalyptic number.

It is an amenable number.

7678106561 is a deficient number, since it is larger than the sum of its proper divisors (1).

7678106561 is an equidigital number, since it uses as much as digits as its factorization.

7678106561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 7678106561 is about 87624.8056260326. The cubic root of 7678106561 is about 1972.8075064808.

The spelling of 7678106561 in words is "seven billion, six hundred seventy-eight million, one hundred six thousand, five hundred sixty-one".