266844135403872 has 216 divisors, whose sum is σ = 821792909587104. Its totient is φ = 82096637156352.

The previous prime is 266844135403871. The next prime is 266844135404009. The reversal of 266844135403872 is 278304531448662.

266844135403872 is a `hidden beast` number, since 2 + 6 + 6 + 8 + 4 + 4 + 1 + 3 + 540 + 3 + 87 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266844135403871) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 438084358 + ... + 438693050.

It is an arithmetic number, because the mean of its divisors is an integer number (3804596803644).

Almost surely, 2^{266844135403872} 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 266844135403872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (410896454793552).

266844135403872 is an abundant number, since it is smaller than the sum of its proper divisors (554948774183232).

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

266844135403872 is a wasteful number, since it uses less digits than its factorization.

266844135403872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617742 (or 617718 counting only the distinct ones).

The product of its (nonzero) digits is 185794560, while the sum is 63.

The spelling of 266844135403872 in words is "two hundred sixty-six trillion, eight hundred forty-four billion, one hundred thirty-five million, four hundred three thousand, eight hundred seventy-two".