26664566400 has 288 divisors, whose sum is σ = 97174584000. Its totient is φ = 6958909440.

The previous prime is 26664566387. The next prime is 26664566417. The reversal of 26664566400 is 466546662.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 35 ways as a sum of consecutive naturals, for example, 1343751 + ... + 1363449.

It is an arithmetic number, because the mean of its divisors is an integer number (337411750).

Almost surely, 2^26664566400 is an apocalyptic number.

26664566400 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 26664566400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48587292000).

26664566400 is an abundant number, since it is smaller than the sum of its proper divisors (70510017600).

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

26664566400 is a wasteful number, since it uses less digits than its factorization.

26664566400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19776 (or 19756 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 26664566400 in words is "twenty-six billion, six hundred sixty-four million, five hundred sixty-six thousand, four hundred".