26391953538 has 24 divisors (see below), whose sum is σ = 57498498876. Its totient is φ = 8748712800.

The previous prime is 26391953521. The next prime is 26391953551. The reversal of 26391953538 is 83535919362.

26391953538 is a `hidden beast` number, since 2 + 63 + 9 + 19 + 535 + 38 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22015734129 + 4376219409 = 148377^2 + 66153^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4047073 + ... + 4053588.

Almost surely, 2^26391953538 is an apocalyptic number.

26391953538 is an abundant number, since it is smaller than the sum of its proper divisors (31106545338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26391953538 is a wasteful number, since it uses less digits than its factorization.

26391953538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8100850 (or 8100847 counting only the distinct ones).

The product of its digits is 5248800, while the sum is 54.

The spelling of 26391953538 in words is "twenty-six billion, three hundred ninety-one million, nine hundred fifty-three thousand, five hundred thirty-eight".