26128265089 has 4 divisors (see below), whose sum is σ = 26128645956. Its totient is φ = 26127884224.

The previous prime is 26128265087. The next prime is 26128265101. The reversal of 26128265089 is 98056282162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11820038400 + 14308226689 = 108720^2 + 119617^2 .

It is a cyclic number.

It is not a de Polignac number, because 26128265089 - 2¹ = 26128265087 is a prime.

It is a super-2 number, since 2×26128265089² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26128265081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55804 + ... + 235309.

It is an arithmetic number, because the mean of its divisors is an integer number (6532161489).

Almost surely, 2^26128265089 is an apocalyptic number.

It is an amenable number.

26128265089 is a deficient number, since it is larger than the sum of its proper divisors (380867).

26128265089 is an equidigital number, since it uses as much as digits as its factorization.

26128265089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380866.

The product of its (nonzero) digits is 829440, while the sum is 49.

The spelling of 26128265089 in words is "twenty-six billion, one hundred twenty-eight million, two hundred sixty-five thousand, eighty-nine".