26001239989 has 2 divisors, whose sum is σ = 26001239990. Its totient is φ = 26001239988.

The previous prime is 26001239981. The next prime is 26001240011. The reversal of 26001239989 is 98993210062.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25549464964 + 451775025 = 159842^2 + 21255^2 .

It is a cyclic number.

It is not a de Polignac number, because 26001239989 - 2³ = 26001239981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26001239981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13000619994 + 13000619995.

It is an arithmetic number, because the mean of its divisors is an integer number (13000619995).

Almost surely, 2^26001239989 is an apocalyptic number.

It is an amenable number.

26001239989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26001239989 is an equidigital number, since it uses as much as digits as its factorization.

26001239989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The spelling of 26001239989 in words is "twenty-six billion, one million, two hundred thirty-nine thousand, nine hundred eighty-nine".