26608691009 has 4 divisors (see below), whose sum is σ = 26612554800. Its totient is φ = 26604827220.

The previous prime is 26608691003. The next prime is 26608691029. The reversal of 26608691009 is 90019680662.

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 a de Polignac number, because none of the positive numbers 2^k-26608691009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26608691003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1921547 + ... + 1935344.

It is an arithmetic number, because the mean of its divisors is an integer number (6653138700).

Almost surely, 2^26608691009 is an apocalyptic number.

It is an amenable number.

26608691009 is a deficient number, since it is larger than the sum of its proper divisors (3863791).

26608691009 is an equidigital number, since it uses as much as digits as its factorization.

26608691009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3863790.

The product of its (nonzero) digits is 279936, while the sum is 47.

The spelling of 26608691009 in words is "twenty-six billion, six hundred eight million, six hundred ninety-one thousand, nine".