26891999959 has 8 divisors (see below), whose sum is σ = 29419838352. Its totient is φ = 24378013440.

The previous prime is 26891999957. The next prime is 26891999963. The reversal of 26891999959 is 95999919862.

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

It is not a de Polignac number, because 26891999959 - 2¹ = 26891999957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26891999951) 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, 3458904 + ... + 3466669.

It is an arithmetic number, because the mean of its divisors is an integer number (3677479794).

Almost surely, 2^26891999959 is an apocalyptic number.

26891999959 is a deficient number, since it is larger than the sum of its proper divisors (2527838393).

26891999959 is a wasteful number, since it uses less digits than its factorization.

26891999959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925937.

The product of its digits is 255091680, while the sum is 76.

The spelling of 26891999959 in words is "twenty-six billion, eight hundred ninety-one million, nine hundred ninety-nine thousand, nine hundred fifty-nine".