266981652 has 72 divisors (see below), whose sum is σ = 774760896. Its totient is φ = 75936384.

The previous prime is 266981647. The next prime is 266981653. The reversal of 266981652 is 256189662.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 266981598 and 266981607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266981653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56443 + ... + 60989.

It is an arithmetic number, because the mean of its divisors is an integer number (10760568).

Almost surely, 2^266981652 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266981652, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387380448).

266981652 is an abundant number, since it is smaller than the sum of its proper divisors (507779244).

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

266981652 is a wasteful number, since it uses less digits than its factorization.

266981652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4797 (or 4792 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 266981652 is about 16339.5731890402. The cubic root of 266981652 is about 643.9129191825.

The spelling of 266981652 in words is "two hundred sixty-six million, nine hundred eighty-one thousand, six hundred fifty-two".