66020020644620 has 48 divisors (see below), whose sum is σ = 158467467563328. Its totient is φ = 22632661647360.

The previous prime is 66020020644593. The next prime is 66020020644637. The reversal of 66020020644620 is 2644602002066.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27749237 + ... + 30034316.

It is an arithmetic number, because the mean of its divisors is an integer number (3301405574236).

Almost surely, 2^{66020020644620} is an apocalyptic number.

It is an amenable number.

66020020644620 is an abundant number, since it is smaller than the sum of its proper divisors (92447446918708).

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

66020020644620 is a wasteful number, since it uses less digits than its factorization.

66020020644620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57791730 (or 57791728 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

Adding to 66020020644620 its reverse (2644602002066), we get a palindrome (68664622646686).

The spelling of 66020020644620 in words is "sixty-six trillion, twenty billion, twenty million, six hundred forty-four thousand, six hundred twenty".