66820196 has 12 divisors (see below), whose sum is σ = 118141548. Its totient is φ = 33065472.

The previous prime is 66820189. The next prime is 66820211. The reversal of 66820196 is 69102866.

It can be written as a sum of positive squares in 2 ways, for example, as 12503296 + 54316900 = 3536^2 + 7370^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85721 + ... + 86496.

It is an arithmetic number, because the mean of its divisors is an integer number (9845129).

Almost surely, 2^66820196 is an apocalyptic number.

It is an amenable number.

66820196 is a deficient number, since it is larger than the sum of its proper divisors (51321352).

66820196 is a wasteful number, since it uses less digits than its factorization.

66820196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172318 (or 172316 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 66820196 is about 8174.3621157862. The cubic root of 66820196 is about 405.7911598741.

The spelling of 66820196 in words is "sixty-six million, eight hundred twenty thousand, one hundred ninety-six".