26628771649 has 2 divisors, whose sum is σ = 26628771650. Its totient is φ = 26628771648.

The previous prime is 26628771641. The next prime is 26628771691. The reversal of 26628771649 is 94617782662.

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., 17614598400 + 9014173249 = 132720^2 + 94943^2 .

It is a cyclic number.

It is not a de Polignac number, because 26628771649 - 2³ = 26628771641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26628771593 and 26628771602.

It is not a weakly prime, because it can be changed into another prime (26628771641) 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, 13314385824 + 13314385825.

It is an arithmetic number, because the mean of its divisors is an integer number (13314385825).

Almost surely, 2^26628771649 is an apocalyptic number.

It is an amenable number.

26628771649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26628771649 is an equidigital number, since it uses as much as digits as its factorization.

26628771649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 58.

The spelling of 26628771649 in words is "twenty-six billion, six hundred twenty-eight million, seven hundred seventy-one thousand, six hundred forty-nine".