266850785456640 has 4480 divisors, whose sum is σ = 1268723162234880. Its totient is φ = 52178278809600.

The previous prime is 266850785456599. The next prime is 266850785456669. The reversal of 266850785456640 is 46654587058662.

266850785456640 is a `hidden beast` number, since 2 + 6 + 6 + 8 + 5 + 0 + 7 + 8 + 54 + 566 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (4480).

It is a Harshad number since it is a multiple of its sum of digits (72).

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 447 ways as a sum of consecutive naturals, for example, 164824449751 + ... + 164824451369.

Almost surely, 2^{266850785456640} is an apocalyptic number.

266850785456640 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 266850785456640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (634361581117440).

266850785456640 is an abundant number, since it is smaller than the sum of its proper divisors (1001872376778240).

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

266850785456640 is a wasteful number, since it uses less digits than its factorization.

266850785456640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1715 counting only the distinct ones).

The product of its (nonzero) digits is 2322432000, while the sum is 72.

The spelling of 266850785456640 in words is "two hundred sixty-six trillion, eight hundred fifty billion, seven hundred eighty-five million, four hundred fifty-six thousand, six hundred forty".