66424442 has 48 divisors (see below), whose sum is σ = 122376960. Its totient is φ = 26445216.

The previous prime is 66424441. The next prime is 66424459. The reversal of 66424442 is 24442466.

It is a super-2 number, since 2×66424442² = 8824412990022728, which contains 22 as substring.

Its product of digits (36864) is a multiple of the sum of its prime divisors (144).

It is a junction number, because it is equal to n+sod(n) for n = 66424399 and 66424408.

It is not an unprimeable number, because it can be changed into a prime (66424441) 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 23 ways as a sum of consecutive naturals, for example, 1125809 + ... + 1125867.

It is an arithmetic number, because the mean of its divisors is an integer number (2549520).

Almost surely, 2^66424442 is an apocalyptic number.

66424442 is a deficient number, since it is larger than the sum of its proper divisors (55952518).

66424442 is a wasteful number, since it uses less digits than its factorization.

66424442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 144 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

The square root of 66424442 is about 8150.1191402335. The cubic root of 66424442 is about 404.9884506182.

It can be divided in two parts, 66424 and 442, that added together give a palindrome (66866).

The spelling of 66424442 in words is "sixty-six million, four hundred twenty-four thousand, four hundred forty-two".