26138185981 has 8 divisors (see below), whose sum is σ = 27556682720. Its totient is φ = 24723969552.

The previous prime is 26138185961. The next prime is 26138186017. The reversal of 26138185981 is 18958183162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26138185981 - 2²³ = 26129797373 is a prime.

It is a super-2 number, since 2×26138185981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26138185901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1057530 + ... + 1081963.

It is an arithmetic number, because the mean of its divisors is an integer number (3444585340).

Almost surely, 2^26138185981 is an apocalyptic number.

It is an amenable number.

26138185981 is a deficient number, since it is larger than the sum of its proper divisors (1418496739).

26138185981 is a wasteful number, since it uses less digits than its factorization.

26138185981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140155.

The product of its digits is 829440, while the sum is 52.

The spelling of 26138185981 in words is "twenty-six billion, one hundred thirty-eight million, one hundred eighty-five thousand, nine hundred eighty-one".