26271319644 has 72 divisors (see below), whose sum is σ = 68618659200. Its totient is φ = 8466163200.

The previous prime is 26271319639. The next prime is 26271319649. The reversal of 26271319644 is 44691317262.

26271319644 is a `hidden beast` number, since 2 + 6 + 271 + 319 + 64 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (26271319639) and next prime (26271319649).

It is a self number, because there is not a number n which added to its sum of digits gives 26271319644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26271319649) 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 23 ways as a sum of consecutive naturals, for example, 1159464 + ... + 1181904.

Almost surely, 2^26271319644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26271319644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34309329600).

26271319644 is an abundant number, since it is smaller than the sum of its proper divisors (42347339556).

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

26271319644 is a wasteful number, since it uses less digits than its factorization.

26271319644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23531 (or 23526 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The spelling of 26271319644 in words is "twenty-six billion, two hundred seventy-one million, three hundred nineteen thousand, six hundred forty-four".