266253540 has 48 divisors (see below), whose sum is σ = 852012672. Its totient is φ = 60857856.

The previous prime is 266253539. The next prime is 266253551. The reversal of 266253540 is 45352662.

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, 316549 + ... + 317388.

It is an arithmetic number, because the mean of its divisors is an integer number (17750264).

Almost surely, 2^266253540 is an apocalyptic number.

266253540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266253540 is an abundant number, since it is smaller than the sum of its proper divisors (585759132).

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

266253540 is a wasteful number, since it uses less digits than its factorization.

266253540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633956 (or 633954 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 266253540 is about 16317.2773464203. The cubic root of 266253540 is about 643.3270267637.

The spelling of 266253540 in words is "two hundred sixty-six million, two hundred fifty-three thousand, five hundred forty".