26601581213 has 4 divisors (see below), whose sum is σ = 27459696768. Its totient is φ = 25743465660.

The previous prime is 26601581203. The next prime is 26601581233. The reversal of 26601581213 is 31218510662.

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 26601581213 - 2²⁸ = 26333145757 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 (26601581203) 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 3 ways as a sum of consecutive naturals, for example, 429057731 + ... + 429057792.

It is an arithmetic number, because the mean of its divisors is an integer number (6864924192).

Almost surely, 2^26601581213 is an apocalyptic number.

It is an amenable number.

26601581213 is a deficient number, since it is larger than the sum of its proper divisors (858115555).

26601581213 is an equidigital number, since it uses as much as digits as its factorization.

26601581213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858115554.

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 26601581213 in words is "twenty-six billion, six hundred one million, five hundred eighty-one thousand, two hundred thirteen".