66696385 has 16 divisors (see below), whose sum is σ = 93943296. Its totient is φ = 44497728.

The previous prime is 66696367. The next prime is 66696451. The reversal of 66696385 is 58369666.

It is a cyclic number.

It is not a de Polignac number, because 66696385 - 2⁵ = 66696353 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, 24457 + ... + 27046.

It is an arithmetic number, because the mean of its divisors is an integer number (5871456).

Almost surely, 2^66696385 is an apocalyptic number.

It is an amenable number.

66696385 is a deficient number, since it is larger than the sum of its proper divisors (27246911).

66696385 is a wasteful number, since it uses less digits than its factorization.

66696385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51552.

The product of its digits is 1399680, while the sum is 49.

The square root of 66696385 is about 8166.7854753263. The cubic root of 66696385 is about 405.5403750564.

It can be divided in two parts, 66696 and 385, that added together give a square (67081 = 259²).

The spelling of 66696385 in words is "sixty-six million, six hundred ninety-six thousand, three hundred eighty-five".