26663981760 has 504 divisors, whose sum is σ = 103039438320. Its totient is φ = 6560206848.

The previous prime is 26663981749. The next prime is 26663981777. The reversal of 26663981760 is 6718936662.

It is a super-2 number, since 2×26663981760² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 26663981697 and 26663981706.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13140426 + ... + 13142454.

It is an arithmetic number, because the mean of its divisors is an integer number (204443330).

Almost surely, 2^26663981760 is an apocalyptic number.

26663981760 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 26663981760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51519719160).

26663981760 is an abundant number, since it is smaller than the sum of its proper divisors (76375456560).

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

26663981760 is a wasteful number, since it uses less digits than its factorization.

26663981760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087 (or 2052 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 54.

The spelling of 26663981760 in words is "twenty-six billion, six hundred sixty-three million, nine hundred eighty-one thousand, seven hundred sixty".