26866047517 has 4 divisors (see below), whose sum is σ = 26873599840. Its totient is φ = 26858495196.

The previous prime is 26866047511. The next prime is 26866047547. The reversal of 26866047517 is 71574066862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26866047517 - 2³¹ = 24718563869 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 (26866047511) 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 3 ways as a sum of consecutive naturals, for example, 3770823 + ... + 3777940.

It is an arithmetic number, because the mean of its divisors is an integer number (6718399960).

Almost surely, 2^26866047517 is an apocalyptic number.

It is an amenable number.

26866047517 is a deficient number, since it is larger than the sum of its proper divisors (7552323).

26866047517 is an equidigital number, since it uses as much as digits as its factorization.

26866047517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7552322.

The product of its (nonzero) digits is 3386880, while the sum is 52.

The spelling of 26866047517 in words is "twenty-six billion, eight hundred sixty-six million, forty-seven thousand, five hundred seventeen".