266545550478240 has 768 divisors, whose sum is σ = 1056200095641600. Its totient is φ = 62188219699200.

The previous prime is 266545550478239. The next prime is 266545550478247. The reversal of 266545550478240 is 42874055545662.

266545550478240 is a `hidden beast` number, since 2 + 6 + 6 + 5 + 4 + 5 + 5 + 504 + 7 + 82 + 40 = 666.

It is not an unprimeable number, because it can be changed into a prime (266545550478247) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 428271919 + ... + 428893841.

It is an arithmetic number, because the mean of its divisors is an integer number (1375260541200).

Almost surely, 2^{266545550478240} is an apocalyptic number.

266545550478240 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 266545550478240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (528100047820800).

266545550478240 is an abundant number, since it is smaller than the sum of its proper divisors (789654545163360).

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

266545550478240 is a wasteful number, since it uses less digits than its factorization.

266545550478240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 622298 (or 622284 counting only the distinct ones).

The product of its (nonzero) digits is 322560000, while the sum is 63.

The spelling of 266545550478240 in words is "two hundred sixty-six trillion, five hundred forty-five billion, five hundred fifty million, four hundred seventy-eight thousand, two hundred forty".