66560265 has 32 divisors (see below), whose sum is σ = 119846400. Its totient is φ = 35049456.

The previous prime is 66560257. The next prime is 66560267. The reversal of 66560265 is 56206566.

It is not a de Polignac number, because 66560265 - 2³ = 66560257 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66560267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 842496 + ... + 842574.

It is an arithmetic number, because the mean of its divisors is an integer number (3745200).

Almost surely, 2^66560265 is an apocalyptic number.

It is an amenable number.

66560265 is a deficient number, since it is larger than the sum of its proper divisors (53286135).

66560265 is an frugal number, since it uses more digits than its factorization.

66560265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 87 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 66560265 is about 8158.4474625997. The cubic root of 66560265 is about 405.2642993624.

The spelling of 66560265 in words is "sixty-six million, five hundred sixty thousand, two hundred sixty-five".