26634616409 has 2 divisors, whose sum is σ = 26634616410. Its totient is φ = 26634616408.

The previous prime is 26634616381. The next prime is 26634616471. The reversal of 26634616409 is 90461643662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24202647184 + 2431969225 = 155572^2 + 49315^2 .

It is a cyclic number.

It is not a de Polignac number, because 26634616409 - 2⁸ = 26634616153 is a prime.

It is not a weakly prime, because it can be changed into another prime (26634616609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13317308204 + 13317308205.

It is an arithmetic number, because the mean of its divisors is an integer number (13317308205).

Almost surely, 2^26634616409 is an apocalyptic number.

It is an amenable number.

26634616409 is a deficient number, since it is larger than the sum of its proper divisors (1).

26634616409 is an equidigital number, since it uses as much as digits as its factorization.

26634616409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1119744, while the sum is 47.

The spelling of 26634616409 in words is "twenty-six billion, six hundred thirty-four million, six hundred sixteen thousand, four hundred nine".