66606020220 has 48 divisors (see below), whose sum is σ = 188857589760. Its totient is φ = 17536773696.

The previous prime is 66606020177. The next prime is 66606020227. The reversal of 66606020220 is 2202060666.

66606020220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66606020227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7021212 + ... + 7030691.

It is an arithmetic number, because the mean of its divisors is an integer number (3934533120).

Almost surely, 2^66606020220 is an apocalyptic number.

66606020220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66606020220 is an abundant number, since it is smaller than the sum of its proper divisors (122251569540).

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

66606020220 is a wasteful number, since it uses less digits than its factorization.

66606020220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14051994 (or 14051992 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 66606020220 its reverse (2202060666), we get a palindrome (68808080886).

The spelling of 66606020220 in words is "sixty-six billion, six hundred six million, twenty thousand, two hundred twenty".