266396195520 has 1792 divisors, whose sum is σ = 1209290342400. Its totient is φ = 54392684544.

The previous prime is 266396195477. The next prime is 266396195573. The reversal of 266396195520 is 25591693662.

It is a happy number.

266396195520 is a `hidden beast` number, since 2 + 66 + 396 + 195 + 5 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 2993215636 + ... + 2993215724.

It is an arithmetic number, because the mean of its divisors is an integer number (674827200).

Almost surely, 2^266396195520 is an apocalyptic number.

266396195520 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 266396195520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (604645171200).

266396195520 is an abundant number, since it is smaller than the sum of its proper divisors (942894146880).

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

266396195520 is an equidigital number, since it uses as much as digits as its factorization.

266396195520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 5248800, while the sum is 54.

The spelling of 266396195520 in words is "two hundred sixty-six billion, three hundred ninety-six million, one hundred ninety-five thousand, five hundred twenty".