266553939456 has 640 divisors, whose sum is σ = 943173918720. Its totient is φ = 73634365440.

The previous prime is 266553939451. The next prime is 266553939467. The reversal of 266553939456 is 654939355662.

It is a happy number.

266553939456 is a `hidden beast` number, since 2 + 6 + 6 + 5 + 539 + 3 + 94 + 5 + 6 = 666.

266553939456 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 266553939393 and 266553939402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266553939451) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 242983900 + ... + 242984996.

It is an arithmetic number, because the mean of its divisors is an integer number (1473709248).

Almost surely, 2^266553939456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266553939456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (471586959360).

266553939456 is an abundant number, since it is smaller than the sum of its proper divisors (676619979264).

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

266553939456 is an frugal number, since it uses more digits than its factorization.

266553939456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174 (or 1140 counting only the distinct ones).

The product of its digits is 157464000, while the sum is 63.

The spelling of 266553939456 in words is "two hundred sixty-six billion, five hundred fifty-three million, nine hundred thirty-nine thousand, four hundred fifty-six".