66008221050 has 96 divisors (see below), whose sum is σ = 165146376384. Its totient is φ = 17447040000.

The previous prime is 66008221033. The next prime is 66008221057. The reversal of 66008221050 is 5012280066.

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

It is a junction number, because it is equal to n+sod(n) for n = 66008220999 and 66008221017.

It is not an unprimeable number, because it can be changed into a prime (66008221057) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 23598252 + ... + 23601048.

It is an arithmetic number, because the mean of its divisors is an integer number (1720274754).

Almost surely, 2^66008221050 is an apocalyptic number.

66008221050 is the 209775-th pentagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66008221050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82573188192).

66008221050 is an abundant number, since it is smaller than the sum of its proper divisors (99138155334).

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

66008221050 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (66008221049) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (4144).

66008221050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4144 (or 4139 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The spelling of 66008221050 in words is "sixty-six billion, eight million, two hundred twenty-one thousand, fifty".