266749866880 has 384 divisors, whose sum is σ = 779192524800. Its totient is φ = 85522022400.

The previous prime is 266749866853. The next prime is 266749866881. The reversal of 266749866880 is 88668947662.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266749866881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 231754305 + ... + 231755455.

It is an arithmetic number, because the mean of its divisors is an integer number (2029147200).

Almost surely, 2^266749866880 is an apocalyptic number.

266749866880 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 266749866880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (389596262400).

266749866880 is an abundant number, since it is smaller than the sum of its proper divisors (512442657920).

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

266749866880 is a wasteful number, since it uses less digits than its factorization.

266749866880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1390 (or 1361 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 70.

The spelling of 266749866880 in words is "two hundred sixty-six billion, seven hundred forty-nine million, eight hundred sixty-six thousand, eight hundred eighty".