266505540 has 96 divisors (see below), whose sum is σ = 857412864. Its totient is φ = 60587520.

The previous prime is 266505509. The next prime is 266505559. The reversal of 266505540 is 45505662.

It is a happy number.

266505540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81130 + ... + 84350.

It is an arithmetic number, because the mean of its divisors is an integer number (8931384).

Almost surely, 2^266505540 is an apocalyptic number.

266505540 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 266505540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (428706432).

266505540 is an abundant number, since it is smaller than the sum of its proper divisors (590907324).

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

266505540 is a wasteful number, since it uses less digits than its factorization.

266505540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3437 (or 3435 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

The square root of 266505540 is about 16324.9973966307. The cubic root of 266505540 is about 643.5299252129.

The spelling of 266505540 in words is "two hundred sixty-six million, five hundred five thousand, five hundred forty".