26221530655 has 4 divisors (see below), whose sum is σ = 31465836792. Its totient is φ = 20977224520.

The previous prime is 26221530653. The next prime is 26221530679. The reversal of 26221530655 is 55603512262.

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

It is not a de Polignac number, because 26221530655 - 2¹ = 26221530653 is a prime.

It is a super-2 number, since 2×26221530655² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26221530653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2622153061 + ... + 2622153070.

It is an arithmetic number, because the mean of its divisors is an integer number (7866459198).

Almost surely, 2^26221530655 is an apocalyptic number.

26221530655 is a deficient number, since it is larger than the sum of its proper divisors (5244306137).

26221530655 is an equidigital number, since it uses as much as digits as its factorization.

26221530655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5244306136.

The product of its (nonzero) digits is 108000, while the sum is 37.

The spelling of 26221530655 in words is "twenty-six billion, two hundred twenty-one million, five hundred thirty thousand, six hundred fifty-five".