26731019989 has 2 divisors, whose sum is σ = 26731019990. Its totient is φ = 26731019988.

The previous prime is 26731019981. The next prime is 26731020011. The reversal of 26731019989 is 98991013762.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26539668100 + 191351889 = 162910^2 + 13833^2 .

It is a cyclic number.

It is not a de Polignac number, because 26731019989 - 2³ = 26731019981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26731019981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13365509994 + 13365509995.

It is an arithmetic number, because the mean of its divisors is an integer number (13365509995).

Almost surely, 2^26731019989 is an apocalyptic number.

It is an amenable number.

26731019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26731019989 is an equidigital number, since it uses as much as digits as its factorization.

26731019989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 55.

The spelling of 26731019989 in words is "twenty-six billion, seven hundred thirty-one million, nineteen thousand, nine hundred eighty-nine".