26450111605409 has 2 divisors, whose sum is σ = 26450111605410. Its totient is φ = 26450111605408.

The previous prime is 26450111605403. The next prime is 26450111605429. The reversal of 26450111605409 is 90450611105462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26203546723600 + 246564881809 = 5118940^2 + 496553^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26450111605409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26450111605409.

It is not a weakly prime, because it can be changed into another prime (26450111605403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13225055802704 + 13225055802705.

It is an arithmetic number, because the mean of its divisors is an integer number (13225055802705).

Almost surely, 2^{26450111605409} is an apocalyptic number.

It is an amenable number.

26450111605409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26450111605409 is an equidigital number, since it uses as much as digits as its factorization.

26450111605409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 44.

The spelling of 26450111605409 in words is "twenty-six trillion, four hundred fifty billion, one hundred eleven million, six hundred five thousand, four hundred nine".