1216650205 has 8 divisors (see below), whose sum is σ = 1523457792. Its totient is φ = 931001808.

The previous prime is 1216650187. The next prime is 1216650223. The reversal of 1216650205 is 5020566121.

It is an interprime number because it is at equal distance from previous prime (1216650187) and next prime (1216650223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216650205 - 2⁷ = 1216650077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5289669 + ... + 5289898.

It is an arithmetic number, because the mean of its divisors is an integer number (190432224).

Almost surely, 2^1216650205 is an apocalyptic number.

It is an amenable number.

1216650205 is a deficient number, since it is larger than the sum of its proper divisors (306807587).

1216650205 is a wasteful number, since it uses less digits than its factorization.

1216650205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10579595.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 1216650205 is about 34880.5132559714. The cubic root of 1216650205 is about 1067.5508677064.

The spelling of 1216650205 in words is "one billion, two hundred sixteen million, six hundred fifty thousand, two hundred five".