66665265 has 16 divisors (see below), whose sum is σ = 109146048. Its totient is φ = 34727616.

The previous prime is 66665251. The next prime is 66665273. The reversal of 66665265 is 56256666.

It is not a de Polignac number, because 66665265 - 2⁵ = 66665233 is a prime.

It is a Curzon number.

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, 51034 + ... + 52323.

It is an arithmetic number, because the mean of its divisors is an integer number (6821628).

Almost surely, 2^66665265 is an apocalyptic number.

It is an amenable number.

66665265 is a deficient number, since it is larger than the sum of its proper divisors (42480783).

66665265 is a wasteful number, since it uses less digits than its factorization.

66665265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103408.

The product of its digits is 388800, while the sum is 42.

The square root of 66665265 is about 8164.8799746230. The cubic root of 66665265 is about 405.4772912784.

The spelling of 66665265 in words is "sixty-six million, six hundred sixty-five thousand, two hundred sixty-five".