266240660 has 24 divisors (see below), whose sum is σ = 638977920. Its totient is φ = 91282464.

The previous prime is 266240659. The next prime is 266240669. The reversal of 266240660 is 66042662.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266240669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 950720 + ... + 950999.

It is an arithmetic number, because the mean of its divisors is an integer number (26624080).

Almost surely, 2^266240660 is an apocalyptic number.

266240660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266240660 is an abundant number, since it is smaller than the sum of its proper divisors (372737260).

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

266240660 is a wasteful number, since it uses less digits than its factorization.

266240660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901735 (or 1901733 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 266240660 is about 16316.8826679608. The cubic root of 266240660 is about 643.3166529601.

The spelling of 266240660 in words is "two hundred sixty-six million, two hundred forty thousand, six hundred sixty".