266555225664 has 336 divisors, whose sum is σ = 945943223680. Its totient is φ = 70297943040.

The previous prime is 266555225633. The next prime is 266555225683. The reversal of 266555225664 is 466522555662.

266555225664 is a `hidden beast` number, since 2 + 6 + 6 + 5 + 5 + 522 + 56 + 64 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 266555225664.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8843259 + ... + 8873349.

Almost surely, 2^266555225664 is an apocalyptic number.

266555225664 is a gapful number since it is divisible by the number (24) 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 266555225664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (472971611840).

266555225664 is an abundant number, since it is smaller than the sum of its proper divisors (679387998016).

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

266555225664 is a wasteful number, since it uses less digits than its factorization.

266555225664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30155 (or 30116 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 54.

The spelling of 266555225664 in words is "two hundred sixty-six billion, five hundred fifty-five million, two hundred twenty-five thousand, six hundred sixty-four".