26550991488 has 128 divisors (see below), whose sum is σ = 80741992320. Its totient is φ = 7572750336.

The previous prime is 26550991487. The next prime is 26550991501. The reversal of 26550991488 is 88419905562.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (26550991487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1585656 + ... + 1602312.

It is an arithmetic number, because the mean of its divisors is an integer number (630796815).

Almost surely, 2^26550991488 is an apocalyptic number.

26550991488 is a gapful number since it is divisible by the number (28) 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 26550991488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40370996160).

26550991488 is an abundant number, since it is smaller than the sum of its proper divisors (54191000832).

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

26550991488 is a wasteful number, since it uses less digits than its factorization.

26550991488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17274 (or 17262 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 57.

The spelling of 26550991488 in words is "twenty-six billion, five hundred fifty million, nine hundred ninety-one thousand, four hundred eighty-eight".