266915680 has 48 divisors (see below), whose sum is σ = 633452400. Its totient is φ = 106281472.

The previous prime is 266915653. The next prime is 266915711. The reversal of 266915680 is 86519662.

266915680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32646 + ... + 39994.

It is an arithmetic number, because the mean of its divisors is an integer number (13196925).

Almost surely, 2^266915680 is an apocalyptic number.

266915680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266915680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (316726200).

266915680 is an abundant number, since it is smaller than the sum of its proper divisors (366536720).

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

266915680 is a wasteful number, since it uses less digits than its factorization.

266915680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7591 (or 7583 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 266915680 is about 16337.5542845311. The cubic root of 266915680 is about 643.8598771822.

The spelling of 266915680 in words is "two hundred sixty-six million, nine hundred fifteen thousand, six hundred eighty".