26722489709 has 2 divisors, whose sum is σ = 26722489710. Its totient is φ = 26722489708.

The previous prime is 26722489691. The next prime is 26722489711. The reversal of 26722489709 is 90798422762.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18291210025 + 8431279684 = 135245^2 + 91822^2 .

It is a cyclic number.

It is not a de Polignac number, because 26722489709 - 2²⁰ = 26721441133 is a prime.

It is a super-2 number, since 2×26722489709² (a number of 22 digits) contains 22 as substring.

Together with 26722489711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26722489799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13361244854 + 13361244855.

It is an arithmetic number, because the mean of its divisors is an integer number (13361244855).

Almost surely, 2^26722489709 is an apocalyptic number.

It is an amenable number.

26722489709 is a deficient number, since it is larger than the sum of its proper divisors (1).

26722489709 is an equidigital number, since it uses as much as digits as its factorization.

26722489709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 26722489709 in words is "twenty-six billion, seven hundred twenty-two million, four hundred eighty-nine thousand, seven hundred nine".