66040220 has 12 divisors (see below), whose sum is σ = 138684504. Its totient is φ = 26416080.

The previous prime is 66040213. The next prime is 66040229. The reversal of 66040220 is 2204066.

It is a super-2 number, since 2×66040220² = 8722621315296800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 3302011 = 66040220 / (6 + 6 + 0 + 4 + 0 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 66040192 and 66040201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66040229) 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 3 ways as a sum of consecutive naturals, for example, 1650986 + ... + 1651025.

It is an arithmetic number, because the mean of its divisors is an integer number (11557042).

Almost surely, 2^66040220 is an apocalyptic number.

It is an amenable number.

66040220 is an abundant number, since it is smaller than the sum of its proper divisors (72644284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66040220 is a wasteful number, since it uses less digits than its factorization.

66040220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3302020 (or 3302018 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 66040220 is about 8126.5133975156. The cubic root of 66040220 is about 404.2060756320.

Adding to 66040220 its reverse (2204066), we get a palindrome (68244286).

The spelling of 66040220 in words is "sixty-six million, forty thousand, two hundred twenty".