266143440000 has 320 divisors, whose sum is σ = 913882464000. Its totient is φ = 68522496000.

The previous prime is 266143439963. The next prime is 266143440037. The reversal of 266143440000 is 44341662.

It is an interprime number because it is at equal distance from previous prime (266143439963) and next prime (266143440037).

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a self number, because there is not a number n which added to its sum of digits gives 266143440000.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6940881 + ... + 6979119.

It is an arithmetic number, because the mean of its divisors is an integer number (2855882700).

Almost surely, 2^266143440000 is an apocalyptic number.

266143440000 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 266143440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (456941232000).

266143440000 is an abundant number, since it is smaller than the sum of its proper divisors (647739024000).

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

266143440000 is an equidigital number, since it uses as much as digits as its factorization.

266143440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38305 (or 38278 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 266143440000 its reverse (44341662), we get a palindrome (266187781662).

The spelling of 266143440000 in words is "two hundred sixty-six billion, one hundred forty-three million, four hundred forty thousand".