26440222649 has 2 divisors, whose sum is σ = 26440222650. Its totient is φ = 26440222648.

The previous prime is 26440222643. The next prime is 26440222717. The reversal of 26440222649 is 94622204462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26428354624 + 11868025 = 162568^2 + 3445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26440222649 is a prime.

It is not a weakly prime, because it can be changed into another prime (26440222643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13220111324 + 13220111325.

It is an arithmetic number, because the mean of its divisors is an integer number (13220111325).

Almost surely, 2^26440222649 is an apocalyptic number.

It is an amenable number.

26440222649 is a deficient number, since it is larger than the sum of its proper divisors (1).

26440222649 is an equidigital number, since it uses as much as digits as its factorization.

26440222649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 331776, while the sum is 41.

The spelling of 26440222649 in words is "twenty-six billion, four hundred forty million, two hundred twenty-two thousand, six hundred forty-nine".