66388356 has 48 divisors (see below), whose sum is σ = 181182400. Its totient is φ = 20964096.

The previous prime is 66388351. The next prime is 66388363. The reversal of 66388356 is 65388366.

66388356 is a `hidden beast` number, since 6 + 638 + 8 + 3 + 5 + 6 = 666.

66388356 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

66388356 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (66388351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14125 + ... + 18228.

Almost surely, 2^66388356 is an apocalyptic number.

It is an amenable number.

66388356 is an abundant number, since it is smaller than the sum of its proper divisors (114794044).

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

66388356 is a wasteful number, since it uses less digits than its factorization.

66388356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32385 (or 32377 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66388356 is about 8147.9050068100. The cubic root of 66388356 is about 404.9150988013.

The spelling of 66388356 in words is "sixty-six million, three hundred eighty-eight thousand, three hundred fifty-six".