26259221916 has 72 divisors (see below), whose sum is σ = 68006955744. Its totient is φ = 8540743680.

The previous prime is 26259221899. The next prime is 26259221917. The reversal of 26259221916 is 61912295262.

26259221916 is a `hidden beast` number, since 2 + 625 + 9 + 2 + 2 + 1 + 9 + 16 = 666.

It is a super-2 number, since 2×26259221916² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26259221917) 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, 194976 + ... + 300888.

It is an arithmetic number, because the mean of its divisors is an integer number (944541052).

Almost surely, 2^26259221916 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26259221916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34003477872).

26259221916 is an abundant number, since it is smaller than the sum of its proper divisors (41747733828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26259221916 is a wasteful number, since it uses less digits than its factorization.

26259221916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106091 (or 106086 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 26259221916 in words is "twenty-six billion, two hundred fifty-nine million, two hundred twenty-one thousand, nine hundred sixteen".