266221468800 has 2016 divisors, whose sum is σ = 1223343682020. Its totient is φ = 56853135360.

The previous prime is 266221468759. The next prime is 266221468819. The reversal of 266221468800 is 8864122662.

266221468800 is a `hidden beast` number, since 2 + 6 + 622 + 14 + 6 + 8 + 8 + 0 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 146333791296 + 119887677504 = 382536^2 + 346248^2 .

It is a tau number, because it is divible by the number of its divisors (2016).

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

It is an unprimeable number.

It is a polite number, since it can be written in 251 ways as a sum of consecutive naturals, for example, 1943222332 + ... + 1943222468.

Almost surely, 2^266221468800 is an apocalyptic number.

266221468800 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 266221468800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611671841010).

266221468800 is an abundant number, since it is smaller than the sum of its proper divisors (957122213220).

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

266221468800 is a wasteful number, since it uses less digits than its factorization.

266221468800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 266221468800 in words is "two hundred sixty-six billion, two hundred twenty-one million, four hundred sixty-eight thousand, eight hundred".