266446021432440 has 128 divisors (see below), whose sum is σ = 819179900605440. Its totient is φ = 69293614526976.

The previous prime is 266446021432379. The next prime is 266446021432447. The reversal of 266446021432440 is 44234120644662.

266446021432440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 266446021432440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266446021432447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36168672 + ... + 42907631.

It is an arithmetic number, because the mean of its divisors is an integer number (6399842973480).

Almost surely, 2^{266446021432440} is an apocalyptic number.

266446021432440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266446021432440 is an abundant number, since it is smaller than the sum of its proper divisors (552733879173000).

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

266446021432440 is a wasteful number, since it uses less digits than its factorization.

266446021432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79077013 (or 79077009 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 266446021432440 in words is "two hundred sixty-six trillion, four hundred forty-six billion, twenty-one million, four hundred thirty-two thousand, four hundred forty".