66640442202 has 64 divisors (see below), whose sum is σ = 152702444160. Its totient is φ = 21531699072.

The previous prime is 66640442191. The next prime is 66640442227. The reversal of 66640442202 is 20224404666.

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 31 ways as a sum of consecutive naturals, for example, 97278 + ... + 377814.

It is an arithmetic number, because the mean of its divisors is an integer number (2385975690).

Almost surely, 2^66640442202 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66640442202, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76351222080).

66640442202 is an abundant number, since it is smaller than the sum of its proper divisors (86062001958).

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

66640442202 is a wasteful number, since it uses less digits than its factorization.

66640442202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280684 (or 280678 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 36.

Adding to 66640442202 its reverse (20224404666), we get a palindrome (86864846868).

The spelling of 66640442202 in words is "sixty-six billion, six hundred forty million, four hundred forty-two thousand, two hundred two".