26538031809 has 32 divisors (see below), whose sum is σ = 40383383040. Its totient is φ = 17217888336.

The previous prime is 26538031799. The next prime is 26538031841. The reversal of 26538031809 is 90813083562.

It is a happy number.

26538031809 is a `hidden beast` number, since 2 + 6 + 538 + 0 + 31 + 80 + 9 = 666.

It is not a de Polignac number, because 26538031809 - 2⁹ = 26538031297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26538031889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61774 + ... + 238520.

It is an arithmetic number, because the mean of its divisors is an integer number (1261980720).

Almost surely, 2^26538031809 is an apocalyptic number.

It is an amenable number.

26538031809 is a deficient number, since it is larger than the sum of its proper divisors (13845351231).

26538031809 is a wasteful number, since it uses less digits than its factorization.

26538031809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176906 (or 176900 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 26538031809 in words is "twenty-six billion, five hundred thirty-eight million, thirty-one thousand, eight hundred nine".