26601218051215 has 4 divisors (see below), whose sum is σ = 31921461661464. Its totient is φ = 21280974440968.

The previous prime is 26601218051209. The next prime is 26601218051227. The reversal of 26601218051215 is 51215081210662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26601218051215 - 2¹¹ = 26601218049167 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2660121805117 + ... + 2660121805126.

It is an arithmetic number, because the mean of its divisors is an integer number (7980365415366).

Almost surely, 2^{26601218051215} is an apocalyptic number.

26601218051215 is a deficient number, since it is larger than the sum of its proper divisors (5320243610249).

26601218051215 is an equidigital number, since it uses as much as digits as its factorization.

26601218051215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5320243610248.

The product of its (nonzero) digits is 57600, while the sum is 40.

Adding to 26601218051215 its reverse (51215081210662), we get a palindrome (77816299261877).

The spelling of 26601218051215 in words is "twenty-six trillion, six hundred one billion, two hundred eighteen million, fifty-one thousand, two hundred fifteen".