1216605652 has 12 divisors (see below), whose sum is σ = 2131466400. Its totient is φ = 607615256.

The previous prime is 1216605623. The next prime is 1216605653. The reversal of 1216605652 is 2565066121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216605653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167902 + ... + 174997.

It is an arithmetic number, because the mean of its divisors is an integer number (177622200).

Almost surely, 2^1216605652 is an apocalyptic number.

It is an amenable number.

1216605652 is a deficient number, since it is larger than the sum of its proper divisors (914860748).

1216605652 is a wasteful number, since it uses less digits than its factorization.

1216605652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343790 (or 343788 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1216605652 is about 34879.8745983984. The cubic root of 1216605652 is about 1067.5378365234.

The spelling of 1216605652 in words is "one billion, two hundred sixteen million, six hundred five thousand, six hundred fifty-two".