266366658781440 has 1152 divisors, whose sum is σ = 1118504114380800. Its totient is φ = 58732354437120.

The previous prime is 266366658781423. The next prime is 266366658781501. The reversal of 266366658781440 is 44187856663662.

It is a tau number, because it is divible by the number of its divisors (1152).

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 8215345069 + ... + 8215377491.

It is an arithmetic number, because the mean of its divisors is an integer number (970923710400).

Almost surely, 2^{266366658781440} is an apocalyptic number.

266366658781440 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 266366658781440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (559252057190400).

266366658781440 is an abundant number, since it is smaller than the sum of its proper divisors (852137455599360).

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

266366658781440 is a wasteful number, since it uses less digits than its factorization.

266366658781440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33660 (or 33640 counting only the distinct ones).

The product of its (nonzero) digits is 1672151040, while the sum is 72.

The spelling of 266366658781440 in words is "two hundred sixty-six trillion, three hundred sixty-six billion, six hundred fifty-eight million, seven hundred eighty-one thousand, four hundred forty".