66745385 has 32 divisors (see below), whose sum is σ = 99705600. Its totient is φ = 41852160.

The previous prime is 66745337. The next prime is 66745397. The reversal of 66745385 is 58354766.

66745385 = 456² + 457² + ... + 665².

It is not a de Polignac number, because 66745385 - 2¹⁰ = 66744361 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17555 + ... + 21015.

It is an arithmetic number, because the mean of its divisors is an integer number (3115800).

Almost surely, 2^66745385 is an apocalyptic number.

It is an amenable number.

66745385 is a deficient number, since it is larger than the sum of its proper divisors (32960215).

66745385 is a wasteful number, since it uses less digits than its factorization.

66745385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3521.

The product of its digits is 604800, while the sum is 44.

The square root of 66745385 is about 8169.7848808888. The cubic root of 66745385 is about 405.6396638661.

The spelling of 66745385 in words is "sixty-six million, seven hundred forty-five thousand, three hundred eighty-five".