26869172789 has 2 divisors, whose sum is σ = 26869172790. Its totient is φ = 26869172788.

The previous prime is 26869172767. The next prime is 26869172797. The reversal of 26869172789 is 98727196862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19214672689 + 7654500100 = 138617^2 + 87490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26869172789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26869172089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13434586394 + 13434586395.

It is an arithmetic number, because the mean of its divisors is an integer number (13434586395).

Almost surely, 2^26869172789 is an apocalyptic number.

It is an amenable number.

26869172789 is a deficient number, since it is larger than the sum of its proper divisors (1).

26869172789 is an equidigital number, since it uses as much as digits as its factorization.

26869172789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 65.

The spelling of 26869172789 in words is "twenty-six billion, eight hundred sixty-nine million, one hundred seventy-two thousand, seven hundred eighty-nine".