26861981685 has 128 divisors (see below), whose sum is σ = 56378585088. Its totient is φ = 10596096000.

The previous prime is 26861981617. The next prime is 26861981687. The reversal of 26861981685 is 58618916862.

It is not a de Polignac number, because 26861981685 - 2¹⁰ = 26861980661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26861981687) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1744470 + ... + 1759800.

It is an arithmetic number, because the mean of its divisors is an integer number (440457696).

Almost surely, 2^26861981685 is an apocalyptic number.

It is an amenable number.

26861981685 is an abundant number, since it is smaller than the sum of its proper divisors (29516603403).

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

26861981685 is a wasteful number, since it uses less digits than its factorization.

26861981685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15435.

The product of its digits is 9953280, while the sum is 60.

The spelling of 26861981685 in words is "twenty-six billion, eight hundred sixty-one million, nine hundred eighty-one thousand, six hundred eighty-five".