66552443 has 4 divisors (see below), whose sum is σ = 68699328. Its totient is φ = 64405560.

The previous prime is 66552427. The next prime is 66552449. The reversal of 66552443 is 34425566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66552443 - 2⁴ = 66552427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66552449) 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, 1073396 + ... + 1073457.

It is an arithmetic number, because the mean of its divisors is an integer number (17174832).

Almost surely, 2^66552443 is an apocalyptic number.

66552443 is a deficient number, since it is larger than the sum of its proper divisors (2146885).

66552443 is a wasteful number, since it uses less digits than its factorization.

66552443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2146884.

The product of its digits is 86400, while the sum is 35.

The square root of 66552443 is about 8157.9680680915. The cubic root of 66552443 is about 405.2484235165.

The spelling of 66552443 in words is "sixty-six million, five hundred fifty-two thousand, four hundred forty-three".