66020186 has 4 divisors (see below), whose sum is σ = 99030282. Its totient is φ = 33010092.

The previous prime is 66020183. The next prime is 66020203. The reversal of 66020186 is 68102066.

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

It can be written as a sum of positive squares in only one way, i.e., 51051025 + 14969161 = 7145^2 + 3869^2 .

It is not an unprimeable number, because it can be changed into a prime (66020183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16505045 + ... + 16505048.

Almost surely, 2^66020186 is an apocalyptic number.

66020186 is a deficient number, since it is larger than the sum of its proper divisors (33010096).

66020186 is a wasteful number, since it uses less digits than its factorization.

66020186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33010095.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 66020186 is about 8125.2806720753. The cubic root of 66020186 is about 404.1651981005.

The spelling of 66020186 in words is "sixty-six million, twenty thousand, one hundred eighty-six".