26543664378 has 192 divisors, whose sum is σ = 74464026624. Its totient is φ = 6631632000.

The previous prime is 26543664341. The next prime is 26543664397. The reversal of 26543664378 is 87346634562.

26543664378 is a `hidden beast` number, since 2 + 6 + 543 + 6 + 64 + 37 + 8 = 666.

It is a super-2 number, since 2×26543664378² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7431333 + ... + 7434903.

It is an arithmetic number, because the mean of its divisors is an integer number (387833472).

Almost surely, 2^26543664378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26543664378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37232013312).

26543664378 is an abundant number, since it is smaller than the sum of its proper divisors (47920362246).

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

26543664378 is a wasteful number, since it uses less digits than its factorization.

26543664378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3801 (or 3798 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 54.

The spelling of 26543664378 in words is "twenty-six billion, five hundred forty-three million, six hundred sixty-four thousand, three hundred seventy-eight".