26643642022409 has 2 divisors, whose sum is σ = 26643642022410. Its totient is φ = 26643642022408.

The previous prime is 26643642022399. The next prime is 26643642022447. The reversal of 26643642022409 is 90422024634662.

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., 22321816812409 + 4321825210000 = 4724597^2 + 2078900^2 .

It is a cyclic number.

It is not a de Polignac number, because 26643642022409 - 2¹² = 26643642018313 is a prime.

It is not a weakly prime, because it can be changed into another prime (26643642022709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13321821011204 + 13321821011205.

It is an arithmetic number, because the mean of its divisors is an integer number (13321821011205).

Almost surely, 2^{26643642022409} is an apocalyptic number.

It is an amenable number.

26643642022409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26643642022409 is an equidigital number, since it uses as much as digits as its factorization.

26643642022409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 50.

The spelling of 26643642022409 in words is "twenty-six trillion, six hundred forty-three billion, six hundred forty-two million, twenty-two thousand, four hundred nine".