26598779221 has 24 divisors (see below), whose sum is σ = 31474708704. Its totient is φ = 22406640480.

The previous prime is 26598779167. The next prime is 26598779261. The reversal of 26598779221 is 12297789562.

It is not a de Polignac number, because 26598779221 - 2⁷ = 26598779093 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 (26598779261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4549326 + ... + 4555168.

It is an arithmetic number, because the mean of its divisors is an integer number (1311446196).

Almost surely, 2^26598779221 is an apocalyptic number.

It is an amenable number.

26598779221 is a deficient number, since it is larger than the sum of its proper divisors (4875929483).

26598779221 is a wasteful number, since it uses less digits than its factorization.

26598779221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7441 (or 7434 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 58.

The spelling of 26598779221 in words is "twenty-six billion, five hundred ninety-eight million, seven hundred seventy-nine thousand, two hundred twenty-one".