66018020 has 24 divisors (see below), whose sum is σ = 139200768. Its totient is φ = 26300000.

The previous prime is 66018013. The next prime is 66018031. The reversal of 66018020 is 2081066.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1556 + ... + 11595.

It is an arithmetic number, because the mean of its divisors is an integer number (5800032).

Almost surely, 2^66018020 is an apocalyptic number.

It is an amenable number.

66018020 is an abundant number, since it is smaller than the sum of its proper divisors (73182748).

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

66018020 is a wasteful number, since it uses less digits than its factorization.

66018020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13411 (or 13409 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 66018020 is about 8125.1473832787. The cubic root of 66018020 is about 404.1607780817.

Adding to 66018020 its reverse (2081066), we get a palindrome (68099086).

The spelling of 66018020 in words is "sixty-six million, eighteen thousand, twenty".