66199220 has 12 divisors (see below), whose sum is σ = 139018404. Its totient is φ = 26479680.

The previous prime is 66199201. The next prime is 66199307. The reversal of 66199220 is 2299166.

It can be written as a sum of positive squares in 2 ways, for example, as 33686416 + 32512804 = 5804^2 + 5702^2 .

It is a congruent number.

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, 1654961 + ... + 1655000.

It is an arithmetic number, because the mean of its divisors is an integer number (11584867).

Almost surely, 2^66199220 is an apocalyptic number.

It is an amenable number.

66199220 is an abundant number, since it is smaller than the sum of its proper divisors (72819184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66199220 is a wasteful number, since it uses less digits than its factorization.

66199220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3309970 (or 3309968 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 66199220 is about 8136.2903094715. The cubic root of 66199220 is about 404.5302076865.

The spelling of 66199220 in words is "sixty-six million, one hundred ninety-nine thousand, two hundred twenty".