26909449669 has 2 divisors, whose sum is σ = 26909449670. Its totient is φ = 26909449668.

The previous prime is 26909449667. The next prime is 26909449687. The reversal of 26909449669 is 96694490962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22729180644 + 4180269025 = 150762^2 + 64655^2 .

It is a cyclic number.

It is not a de Polignac number, because 26909449669 - 2¹ = 26909449667 is a prime.

It is a super-2 number, since 2×26909449669² (a number of 22 digits) contains 22 as substring.

Together with 26909449667, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 26909449669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26909449667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13454724834 + 13454724835.

It is an arithmetic number, because the mean of its divisors is an integer number (13454724835).

Almost surely, 2^26909449669 is an apocalyptic number.

It is an amenable number.

26909449669 is a deficient number, since it is larger than the sum of its proper divisors (1).

26909449669 is an equidigital number, since it uses as much as digits as its factorization.

26909449669 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45349632, while the sum is 64.

The spelling of 26909449669 in words is "twenty-six billion, nine hundred nine million, four hundred forty-nine thousand, six hundred sixty-nine".