66556424 has 16 divisors (see below), whose sum is σ = 136138320. Its totient is φ = 30252880.

The previous prime is 66556409. The next prime is 66556439. The reversal of 66556424 is 42465566.

66556424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66556409) and next prime (66556439).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 378074 + ... + 378249.

It is an arithmetic number, because the mean of its divisors is an integer number (8508645).

Almost surely, 2^66556424 is an apocalyptic number.

It is an amenable number.

66556424 is an abundant number, since it is smaller than the sum of its proper divisors (69581896).

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

66556424 is a wasteful number, since it uses less digits than its factorization.

66556424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756340 (or 756336 counting only the distinct ones).

The product of its digits is 172800, while the sum is 38.

The square root of 66556424 is about 8158.2120590237. The cubic root of 66556424 is about 405.2565036697.

The spelling of 66556424 in words is "sixty-six million, five hundred fifty-six thousand, four hundred twenty-four".