266491330560 has 1088 divisors, whose sum is σ = 1169698575360. Its totient is φ = 56056872960.

The previous prime is 266491330549. The next prime is 266491330577. The reversal of 266491330560 is 65033194662.

266491330560 is a `hidden beast` number, since 2 + 6 + 6 + 49 + 13 + 30 + 560 = 666.

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

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 805109595 + ... + 805109925.

Almost surely, 2^266491330560 is an apocalyptic number.

266491330560 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 266491330560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (584849287680).

266491330560 is an abundant number, since it is smaller than the sum of its proper divisors (903207244800).

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

266491330560 is an equidigital number, since it uses as much as digits as its factorization.

266491330560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 45.

The spelling of 266491330560 in words is "two hundred sixty-six billion, four hundred ninety-one million, three hundred thirty thousand, five hundred sixty".