66539265 has 16 divisors (see below), whose sum is σ = 114652608. Its totient is φ = 32757696.

The previous prime is 66539261. The next prime is 66539267. The reversal of 66539265 is 56293566.

It is not a de Polignac number, because 66539265 - 2² = 66539261 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66539261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170419 + ... + 170808.

It is an arithmetic number, because the mean of its divisors is an integer number (7165788).

Almost surely, 2^66539265 is an apocalyptic number.

66539265 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66539265 is a deficient number, since it is larger than the sum of its proper divisors (48113343).

66539265 is a wasteful number, since it uses less digits than its factorization.

66539265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341248.

The product of its digits is 291600, while the sum is 42.

The square root of 66539265 is about 8157.1603514949. The cubic root of 66539265 is about 405.2216741040.

The spelling of 66539265 in words is "sixty-six million, five hundred thirty-nine thousand, two hundred sixty-five".