1216641606 has 32 divisors (see below), whose sum is σ = 2481788160. Its totient is φ = 397479264.

The previous prime is 1216641589. The next prime is 1216641631. The reversal of 1216641606 is 6061466121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500911 + ... + 503333.

It is an arithmetic number, because the mean of its divisors is an integer number (77555880).

Almost surely, 2^1216641606 is an apocalyptic number.

1216641606 is an abundant number, since it is smaller than the sum of its proper divisors (1265146554).

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

1216641606 is a wasteful number, since it uses less digits than its factorization.

1216641606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 1216641606 is about 34880.3899920858. The cubic root of 1216641606 is about 1067.5483526336.

The spelling of 1216641606 in words is "one billion, two hundred sixteen million, six hundred forty-one thousand, six hundred six".