26639551680 has 336 divisors, whose sum is σ = 98859258720. Its totient is φ = 6059999232.

The previous prime is 26639551639. The next prime is 26639551693. The reversal of 26639551680 is 8615593662.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×26639551680² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10770924 + ... + 10773396.

Almost surely, 2^26639551680 is an apocalyptic number.

26639551680 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 26639551680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49429629360).

26639551680 is an abundant number, since it is smaller than the sum of its proper divisors (72219707040).

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

26639551680 is a wasteful number, since it uses less digits than its factorization.

26639551680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736 (or 2719 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 51.

The spelling of 26639551680 in words is "twenty-six billion, six hundred thirty-nine million, five hundred fifty-one thousand, six hundred eighty".