26456172221 has 8 divisors (see below), whose sum is σ = 26533388280. Its totient is φ = 26379065088.

The previous prime is 26456172187. The next prime is 26456172283. The reversal of 26456172221 is 12227165462.

It can be written as a sum of positive squares in 4 ways, for example, as 10615180900 + 15840991321 = 103030^2 + 125861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26456172221 - 2³⁴ = 9276303037 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 (26456177221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472505 + ... + 525521.

It is an arithmetic number, because the mean of its divisors is an integer number (3316673535).

Almost surely, 2^26456172221 is an apocalyptic number.

It is an amenable number.

26456172221 is a deficient number, since it is larger than the sum of its proper divisors (77216059).

26456172221 is an equidigital number, since it uses as much as digits as its factorization.

26456172221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54463.

The product of its digits is 80640, while the sum is 38.

The spelling of 26456172221 in words is "twenty-six billion, four hundred fifty-six million, one hundred seventy-two thousand, two hundred twenty-one".