26136405989 has 2 divisors, whose sum is σ = 26136405990. Its totient is φ = 26136405988.

The previous prime is 26136405983. The next prime is 26136406013. The reversal of 26136405989 is 98950463162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26031240964 + 105165025 = 161342^2 + 10255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26136405989 is a prime.

It is a super-2 number, since 2×26136405989² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26136405989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26136405983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13068202994 + 13068202995.

It is an arithmetic number, because the mean of its divisors is an integer number (13068202995).

Almost surely, 2^26136405989 is an apocalyptic number.

It is an amenable number.

26136405989 is a deficient number, since it is larger than the sum of its proper divisors (1).

26136405989 is an equidigital number, since it uses as much as digits as its factorization.

26136405989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2799360, while the sum is 53.

The spelling of 26136405989 in words is "twenty-six billion, one hundred thirty-six million, four hundred five thousand, nine hundred eighty-nine".