266461546881280 has 216 divisors, whose sum is σ = 679580630977752. Its totient is φ = 100081299161088.

The previous prime is 266461546881209. The next prime is 266461546881323. The reversal of 266461546881280 is 82188645164662.

It can be written as a sum of positive squares in 4 ways, for example, as 10535269572864 + 255926277308416 = 3245808^2 + 15997696^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 49663462 + ... + 54766618.

It is an arithmetic number, because the mean of its divisors is an integer number (3146206624897).

Almost surely, 2^{266461546881280} is an apocalyptic number.

266461546881280 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 266461546881280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (339790315488876).

266461546881280 is an abundant number, since it is smaller than the sum of its proper divisors (413119084096472).

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

266461546881280 is a wasteful number, since it uses less digits than its factorization.

266461546881280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5103329 (or 5103296 counting only the distinct ones).

The product of its (nonzero) digits is 212336640, while the sum is 67.

The spelling of 266461546881280 in words is "two hundred sixty-six trillion, four hundred sixty-one billion, five hundred forty-six million, eight hundred eighty-one thousand, two hundred eighty".