66429385 has 16 divisors (see below), whose sum is σ = 87417792. Its totient is φ = 48059200.

The previous prime is 66429379. The next prime is 66429403. The reversal of 66429385 is 58392466.

It is not a de Polignac number, because 66429385 - 2⁷ = 66429257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7770 + ... + 13900.

It is an arithmetic number, because the mean of its divisors is an integer number (5463612).

Almost surely, 2^66429385 is an apocalyptic number.

It is an amenable number.

66429385 is a deficient number, since it is larger than the sum of its proper divisors (20988407).

66429385 is a wasteful number, since it uses less digits than its factorization.

66429385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6344.

The product of its digits is 311040, while the sum is 43.

The square root of 66429385 is about 8150.4223816929. The cubic root of 66429385 is about 404.9984961586.

The spelling of 66429385 in words is "sixty-six million, four hundred twenty-nine thousand, three hundred eighty-five".