66198020 has 72 divisors (see below), whose sum is σ = 167005440. Its totient is φ = 21954240.

The previous prime is 66198019. The next prime is 66198031. The reversal of 66198020 is 2089166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29291 + ... + 31469.

It is an arithmetic number, because the mean of its divisors is an integer number (2319520).

Almost surely, 2^66198020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66198020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83502720).

66198020 is an abundant number, since it is smaller than the sum of its proper divisors (100807420).

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

66198020 is a wasteful number, since it uses less digits than its factorization.

66198020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2233 (or 2224 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 66198020 is about 8136.2165654560. The cubic root of 66198020 is about 404.5277633516.

The spelling of 66198020 in words is "sixty-six million, one hundred ninety-eight thousand, twenty".