66085820 has 12 divisors (see below), whose sum is σ = 138780264. Its totient is φ = 26434320.

The previous prime is 66085801. The next prime is 66085823. The reversal of 66085820 is 2858066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66085823) 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, 1652126 + ... + 1652165.

It is an arithmetic number, because the mean of its divisors is an integer number (11565022).

Almost surely, 2^66085820 is an apocalyptic number.

It is an amenable number.

66085820 is an abundant number, since it is smaller than the sum of its proper divisors (72694444).

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

66085820 is a wasteful number, since it uses less digits than its factorization.

66085820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304300 (or 3304298 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 66085820 is about 8129.3185446260. The cubic root of 66085820 is about 404.2990874176.

The spelling of 66085820 in words is "sixty-six million, eighty-five thousand, eight hundred twenty".