66188320 has 48 divisors (see below), whose sum is σ = 170589888. Its totient is φ = 24067840.

The previous prime is 66188263. The next prime is 66188341. The reversal of 66188320 is 2388166.

66188320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 7 ways as a sum of consecutive naturals, for example, 17044 + ... + 20563.

It is an arithmetic number, because the mean of its divisors is an integer number (3553956).

Almost surely, 2^66188320 is an apocalyptic number.

It is an amenable number.

66188320 is an abundant number, since it is smaller than the sum of its proper divisors (104401568).

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

66188320 is a wasteful number, since it uses less digits than its factorization.

66188320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37633 (or 37625 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 66188320 is about 8135.6204434573. The cubic root of 66188320 is about 404.5080038937.

The spelling of 66188320 in words is "sixty-six million, one hundred eighty-eight thousand, three hundred twenty".