26601056221 has 16 divisors (see below), whose sum is σ = 28470388464. Its totient is φ = 24765825024.

The previous prime is 26601056189. The next prime is 26601056227. The reversal of 26601056221 is 12265010662.

It can be written as a sum of positive squares in 8 ways, for example, as 2030493721 + 24570562500 = 45061^2 + 156750^2 .

It is a cyclic number.

It is not a de Polignac number, because 26601056221 - 2⁵ = 26601056189 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 (26601056227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6252531 + ... + 6256783.

It is an arithmetic number, because the mean of its divisors is an integer number (1779399279).

Almost surely, 2^26601056221 is an apocalyptic number.

It is an amenable number.

26601056221 is a deficient number, since it is larger than the sum of its proper divisors (1869332243).

26601056221 is a wasteful number, since it uses less digits than its factorization.

26601056221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8160.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 26601056221 its reverse (12265010662), we get a palindrome (38866066883).

The spelling of 26601056221 in words is "twenty-six billion, six hundred one million, fifty-six thousand, two hundred twenty-one".