266550488640 has 672 divisors, whose sum is σ = 1017394358400. Its totient is φ = 65612574720.

The previous prime is 266550488627. The next prime is 266550488647. The reversal of 266550488640 is 46884055662.

266550488640 is a `hidden beast` number, since 2 + 6 + 6 + 550 + 4 + 8 + 86 + 4 + 0 = 666.

266550488640 is digitally balanced in base 2, 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 (54).

It is not an unprimeable number, because it can be changed into a prime (266550488647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 132545235 + ... + 132547245.

It is an arithmetic number, because the mean of its divisors is an integer number (1513979700).

Almost surely, 2^266550488640 is an apocalyptic number.

266550488640 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 266550488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (508697179200).

266550488640 is an abundant number, since it is smaller than the sum of its proper divisors (750843869760).

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

266550488640 is a wasteful number, since it uses less digits than its factorization.

266550488640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112 (or 2073 counting only the distinct ones).

The product of its (nonzero) digits is 11059200, while the sum is 54.

The spelling of 266550488640 in words is "two hundred sixty-six billion, five hundred fifty million, four hundred eighty-eight thousand, six hundred forty".