66564355 has 16 divisors (see below), whose sum is σ = 93842784. Its totient is φ = 44686080.

The previous prime is 66564317. The next prime is 66564397. The reversal of 66564355 is 55346566.

It is a happy number.

It is not a de Polignac number, because 66564355 - 2²⁵ = 33009923 is a prime.

It is a Duffinian 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, 45834 + ... + 47263.

It is an arithmetic number, because the mean of its divisors is an integer number (5865174).

Almost surely, 2^66564355 is an apocalyptic number.

66564355 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66564355 is a deficient number, since it is larger than the sum of its proper divisors (27278429).

66564355 is a wasteful number, since it uses less digits than its factorization.

66564355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93126.

The product of its digits is 324000, while the sum is 40.

The square root of 66564355 is about 8158.6981191854. The cubic root of 66564355 is about 405.2726000957.

It can be divided in two parts, 6656 and 4355, that added together give a palindrome (11011).

The spelling of 66564355 in words is "sixty-six million, five hundred sixty-four thousand, three hundred fifty-five".