266441665220 has 12 divisors (see below), whose sum is σ = 559527497004. Its totient is φ = 106576666080.

The previous prime is 266441665151. The next prime is 266441665277. The reversal of 266441665220 is 22566144662.

It can be written as a sum of positive squares in 2 ways, for example, as 179714949184 + 86726716036 = 423928^2 + 294494^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6661041611 + ... + 6661041650.

It is an arithmetic number, because the mean of its divisors is an integer number (46627291417).

Almost surely, 2^266441665220 is an apocalyptic number.

266441665220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266441665220 is an abundant number, since it is smaller than the sum of its proper divisors (293085831784).

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

266441665220 is a wasteful number, since it uses less digits than its factorization.

266441665220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13322083270 (or 13322083268 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 44.

The spelling of 266441665220 in words is "two hundred sixty-six billion, four hundred forty-one million, six hundred sixty-five thousand, two hundred twenty".