7726961155649 has 2 divisors, whose sum is σ = 7726961155650. Its totient is φ = 7726961155648.

The previous prime is 7726961155637. The next prime is 7726961155769. The reversal of 7726961155649 is 9465511696277.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6651318370225 + 1075642785424 = 2579015^2 + 1037132^2 .

It is a cyclic number.

It is not a de Polignac number, because 7726961155649 - 2⁸ = 7726961155393 is a prime.

It is a super-2 number, since 2×7726961155649² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7726961115649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863480577824 + 3863480577825.

It is an arithmetic number, because the mean of its divisors is an integer number (3863480577825).

Almost surely, 2^{7726961155649} is an apocalyptic number.

It is an amenable number.

7726961155649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7726961155649 is an equidigital number, since it uses as much as digits as its factorization.

7726961155649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 171460800, while the sum is 68.

The spelling of 7726961155649 in words is "seven trillion, seven hundred twenty-six billion, nine hundred sixty-one million, one hundred fifty-five thousand, six hundred forty-nine".