66366365 has 16 divisors (see below), whose sum is σ = 86254896. Its totient is φ = 48729600.

The previous prime is 66366359. The next prime is 66366367. The reversal of 66366365 is 56366366.

It can be written as a sum of positive squares in 8 ways, for example, as 4618201 + 61748164 = 2149^2 + 7858^2 .

It is not a de Polignac number, because 66366365 - 2¹⁸ = 66104221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66366367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8945 + ... + 14585.

It is an arithmetic number, because the mean of its divisors is an integer number (5390931).

Almost surely, 2^66366365 is an apocalyptic number.

66366365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66366365 is a deficient number, since it is larger than the sum of its proper divisors (19888531).

66366365 is a wasteful number, since it uses less digits than its factorization.

66366365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5840.

The product of its digits is 349920, while the sum is 41.

The square root of 66366365 is about 8146.5554070417. Note that the first 3 decimals coincide. The cubic root of 66366365 is about 404.8703847788.

Subtracting from 66366365 its reverse (56366366), we obtain a palindrome (9999999).

The spelling of 66366365 in words is "sixty-six million, three hundred sixty-six thousand, three hundred sixty-five".