266842560 has 56 divisors (see below), whose sum is σ = 847228176. Its totient is φ = 71157760.

The previous prime is 266842553. The next prime is 266842571. The reversal of 266842560 is 65248662.

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, 138021 + ... + 139940.

Almost surely, 2^266842560 is an apocalyptic number.

266842560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266842560 is an abundant number, since it is smaller than the sum of its proper divisors (580385616).

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

266842560 is a wasteful number, since it uses less digits than its factorization.

266842560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277981 (or 277971 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 266842560 is about 16335.3163422078. The cubic root of 266842560 is about 643.8010779216.

The spelling of 266842560 in words is "two hundred sixty-six million, eight hundred forty-two thousand, five hundred sixty".