66312818 has 64 divisors (see below), whose sum is σ = 129330432. Its totient is φ = 25006080.

The previous prime is 66312811. The next prime is 66312823. The reversal of 66312818 is 81821366.

It is a super-2 number, since 2×66312818² = 8794779662202248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66312811) 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 31 ways as a sum of consecutive naturals, for example, 111530 + ... + 112122.

It is an arithmetic number, because the mean of its divisors is an integer number (2020788).

Almost surely, 2^66312818 is an apocalyptic number.

66312818 is a deficient number, since it is larger than the sum of its proper divisors (63017614).

66312818 is a wasteful number, since it uses less digits than its factorization.

66312818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 659.

The product of its digits is 13824, while the sum is 35.

The square root of 66312818 is about 8143.2682628046. The cubic root of 66312818 is about 404.7614670173.

It can be divided in two parts, 6631 and 2818, that added together give a palindrome (9449).

The spelling of 66312818 in words is "sixty-six million, three hundred twelve thousand, eight hundred eighteen".