266231054651540 has 192 divisors, whose sum is σ = 657664033598208. Its totient is φ = 89450201702400.

The previous prime is 266231054651539. The next prime is 266231054651543. The reversal of 266231054651540 is 45156450132662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266231054651543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 71606870 + ... + 75233010.

It is an arithmetic number, because the mean of its divisors is an integer number (3425333508324).

Almost surely, 2^{266231054651540} is an apocalyptic number.

266231054651540 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 266231054651540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328832016799104).

266231054651540 is an abundant number, since it is smaller than the sum of its proper divisors (391432978946668).

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

266231054651540 is a wasteful number, since it uses less digits than its factorization.

266231054651540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626538 (or 3626536 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 50.

The spelling of 266231054651540 in words is "two hundred sixty-six trillion, two hundred thirty-one billion, fifty-four million, six hundred fifty-one thousand, five hundred forty".