266391949824 has 2240 divisors, whose sum is σ = 1154134130688. Its totient is φ = 59122483200.

The previous prime is 266391949823. The next prime is 266391949829. The reversal of 266391949824 is 428949193662.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (266391949823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 8593288689 + ... + 8593288719.

Almost surely, 2^266391949824 is an apocalyptic number.

266391949824 is a gapful number since it is divisible by the number (24) 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 266391949824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (577067065344).

266391949824 is an abundant number, since it is smaller than the sum of its proper divisors (887742180864).

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

266391949824 is a wasteful number, since it uses less digits than its factorization.

266391949824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 90 counting only the distinct ones).

The product of its digits is 40310784, while the sum is 63.

The spelling of 266391949824 in words is "two hundred sixty-six billion, three hundred ninety-one million, nine hundred forty-nine thousand, eight hundred twenty-four".