1216166222 has 4 divisors (see below), whose sum is σ = 1824249336. Its totient is φ = 608083110.

The previous prime is 1216166201. The next prime is 1216166251. The reversal of 1216166222 is 2226616121.

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, 304041554 + ... + 304041557.

It is an arithmetic number, because the mean of its divisors is an integer number (456062334).

Almost surely, 2^1216166222 is an apocalyptic number.

1216166222 is a deficient number, since it is larger than the sum of its proper divisors (608083114).

1216166222 is an equidigital number, since it uses as much as digits as its factorization.

1216166222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608083113.

The product of its digits is 3456, while the sum is 29.

The square root of 1216166222 is about 34873.5748382640. The cubic root of 1216166222 is about 1067.4092918188.

The spelling of 1216166222 in words is "one billion, two hundred sixteen million, one hundred sixty-six thousand, two hundred twenty-two".