66388347 has 12 divisors (see below), whose sum is σ = 95967144. Its totient is φ = 44225280.

The previous prime is 66388243. The next prime is 66388351. The reversal of 66388347 is 74388366.

66388347 is a `hidden beast` number, since 6 + 638 + 8 + 3 + 4 + 7 = 666.

It is not a de Polignac number, because 66388347 - 2¹² = 66384251 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66381347) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17272 + ... + 20762.

It is an arithmetic number, because the mean of its divisors is an integer number (7997262).

Almost surely, 2^66388347 is an apocalyptic number.

66388347 is a deficient number, since it is larger than the sum of its proper divisors (29578797).

66388347 is a wasteful number, since it uses less digits than its factorization.

66388347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5610 (or 5607 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 66388347 is about 8147.9044545208. The cubic root of 66388347 is about 404.9150805037.

The spelling of 66388347 in words is "sixty-six million, three hundred eighty-eight thousand, three hundred forty-seven".