66394785 has 32 divisors (see below), whose sum is σ = 111186432. Its totient is φ = 33797120.

The previous prime is 66394763. The next prime is 66394817. The reversal of 66394785 is 58749366.

It is not a de Polignac number, because 66394785 - 2¹² = 66390689 is a prime.

It is a Curzon number.

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, 27757 + ... + 30053.

It is an arithmetic number, because the mean of its divisors is an integer number (3474576).

Almost surely, 2^66394785 is an apocalyptic number.

It is an amenable number.

66394785 is a deficient number, since it is larger than the sum of its proper divisors (44791647).

66394785 is a wasteful number, since it uses less digits than its factorization.

66394785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393.

The product of its digits is 1088640, while the sum is 48.

The square root of 66394785 is about 8148.2995158499. The cubic root of 66394785 is about 404.9281689404.

The spelling of 66394785 in words is "sixty-six million, three hundred ninety-four thousand, seven hundred eighty-five".