26665332500 has 120 divisors (see below), whose sum is σ = 59872834560. Its totient is φ = 10383120000.

The previous prime is 26665332497. The next prime is 26665332521. The reversal of 26665332500 is 523356662.

It is a super-2 number, since 2×26665332500² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 26907005 + ... + 26907995.

It is an arithmetic number, because the mean of its divisors is an integer number (498940288).

Almost surely, 2^26665332500 is an apocalyptic number.

26665332500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26665332500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29936417280).

26665332500 is an abundant number, since it is smaller than the sum of its proper divisors (33207502060).

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

26665332500 is a wasteful number, since it uses less digits than its factorization.

26665332500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 38.

The spelling of 26665332500 in words is "twenty-six billion, six hundred sixty-five million, three hundred thirty-two thousand, five hundred".