2221663050666 has 24 divisors (see below), whose sum is σ = 4848739072164. Its totient is φ = 735148843200.

The previous prime is 2221663050521. The next prime is 2221663050773. The reversal of 2221663050666 is 6660503661222.

It can be written as a sum of positive squares in 2 ways, for example, as 2070205870041 + 151457180625 = 1438821^2 + 389175^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 450456385 + ... + 450461316.

Almost surely, 2^{2221663050666} is an apocalyptic number.

2221663050666 is an abundant number, since it is smaller than the sum of its proper divisors (2627076021498).

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

2221663050666 is a wasteful number, since it uses less digits than its factorization.

2221663050666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900917846 (or 900917843 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 45.

The spelling of 2221663050666 in words is "two trillion, two hundred twenty-one billion, six hundred sixty-three million, fifty thousand, six hundred sixty-six".