26666680861 has 8 divisors (see below), whose sum is σ = 29290633920. Its totient is φ = 24164772192.

The previous prime is 26666680837. The next prime is 26666680877. The reversal of 26666680861 is 16808666662.

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 26666680861 - 2⁵ = 26666680829 is a prime.

It is a super-2 number, since 2×26666680861² (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 (26666680801) 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 7 ways as a sum of consecutive naturals, for example, 30510640 + ... + 30511513.

It is an arithmetic number, because the mean of its divisors is an integer number (3661329240).

Almost surely, 2^26666680861 is an apocalyptic number.

It is an amenable number.

26666680861 is a deficient number, since it is larger than the sum of its proper divisors (2623953059).

26666680861 is a wasteful number, since it uses less digits than its factorization.

26666680861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61022195.

The product of its (nonzero) digits is 5971968, while the sum is 55.

The spelling of 26666680861 in words is "twenty-six billion, six hundred sixty-six million, six hundred eighty thousand, eight hundred sixty-one".