66770285 has 4 divisors (see below), whose sum is σ = 80124348. Its totient is φ = 53416224.

The previous prime is 66770279. The next prime is 66770287. The reversal of 66770285 is 58207766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11847364 + 54922921 = 3442^2 + 7411^2 .

It is a cyclic number.

It is not a de Polignac number, because 66770285 - 2¹⁶ = 66704749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66770287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6677024 + ... + 6677033.

It is an arithmetic number, because the mean of its divisors is an integer number (20031087).

Almost surely, 2^66770285 is an apocalyptic number.

It is an amenable number.

66770285 is a deficient number, since it is larger than the sum of its proper divisors (13354063).

66770285 is a wasteful number, since it uses less digits than its factorization.

66770285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13354062.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66770285 is about 8171.3086467224. The cubic root of 66770285 is about 405.6901001715.

The spelling of 66770285 in words is "sixty-six million, seven hundred seventy thousand, two hundred eighty-five".