26564220901 has 8 divisors (see below), whose sum is σ = 26931351320. Its totient is φ = 26197178112.

The previous prime is 26564220899. The next prime is 26564220911. The reversal of 26564220901 is 10902246562.

It can be written as a sum of positive squares in 4 ways, for example, as 11848104801 + 14716116100 = 108849^2 + 121310^2 .

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 26564220901 - 2¹ = 26564220899 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 (26564220911) 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, 799345 + ... + 831913.

It is an arithmetic number, because the mean of its divisors is an integer number (3366418915).

Almost surely, 2^26564220901 is an apocalyptic number.

It is an amenable number.

26564220901 is a deficient number, since it is larger than the sum of its proper divisors (367130419).

26564220901 is a wasteful number, since it uses less digits than its factorization.

26564220901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43815.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 26564220901 in words is "twenty-six billion, five hundred sixty-four million, two hundred twenty thousand, nine hundred one".