2221999966 has 4 divisors (see below), whose sum is σ = 3332999952. Its totient is φ = 1110999982.

The previous prime is 2221999951. The next prime is 2222000029. The reversal of 2221999966 is 6699991222.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555499990 + ... + 555499993.

It is an arithmetic number, because the mean of its divisors is an integer number (833249988).

Almost surely, 2^2221999966 is an apocalyptic number.

2221999966 is a deficient number, since it is larger than the sum of its proper divisors (1110999986).

2221999966 is a wasteful number, since it uses less digits than its factorization.

2221999966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1110999985.

The product of its digits is 1889568, while the sum is 55.

The square root of 2221999966 is about 47138.0946369282. The cubic root of 2221999966 is about 1304.9123737545.

The spelling of 2221999966 in words is "two billion, two hundred twenty-one million, nine hundred ninety-nine thousand, nine hundred sixty-six".