266561712 has 80 divisors (see below), whose sum is σ = 768839680. Its totient is φ = 88423488.

The previous prime is 266561699. The next prime is 266561747. The reversal of 266561712 is 217165662.

It is a happy number.

266561712 is a `hidden beast` number, since 26 + 6 + 5 + 617 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94953 + ... + 97719.

It is an arithmetic number, because the mean of its divisors is an integer number (9610496).

Almost surely, 2^266561712 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 266561712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (384419840).

266561712 is an abundant number, since it is smaller than the sum of its proper divisors (502277968).

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

266561712 is a wasteful number, since it uses less digits than its factorization.

266561712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3007 (or 2995 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 266561712 is about 16326.7177350501. The cubic root of 266561712 is about 643.5751348091.

The spelling of 266561712 in words is "two hundred sixty-six million, five hundred sixty-one thousand, seven hundred twelve".