66388105 has 16 divisors (see below), whose sum is σ = 94187520. Its totient is φ = 43952832.

The previous prime is 66388093. The next prime is 66388117. The reversal of 66388105 is 50188366.

It is an interprime number because it is at equal distance from previous prime (66388093) and next prime (66388117).

It is not a de Polignac number, because 66388105 - 2⁵ = 66388073 is a prime.

It is an unprimeable number.

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, 31689 + ... + 33718.

It is an arithmetic number, because the mean of its divisors is an integer number (5886720).

Almost surely, 2^66388105 is an apocalyptic number.

It is an amenable number.

66388105 is a deficient number, since it is larger than the sum of its proper divisors (27799415).

66388105 is a wasteful number, since it uses less digits than its factorization.

66388105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65448.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 66388105 is about 8147.8896040631. The cubic root of 66388105 is about 404.9145885018.

The spelling of 66388105 in words is "sixty-six million, three hundred eighty-eight thousand, one hundred five".