1216332045 has 30 divisors (see below), whose sum is σ = 2181646698. Its totient is φ = 648336096.

The previous prime is 1216332037. The next prime is 1216332067. The reversal of 1216332045 is 5402336121.

1216332045 is a `hidden beast` number, since 1 + 2 + 1 + 633 + 20 + 4 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 83942244 + 1132389801 = 9162^2 + 33651^2 .

It is not a de Polignac number, because 1216332045 - 2³ = 1216332037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 700999 + ... + 702731.

Almost surely, 2^1216332045 is an apocalyptic number.

1216332045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216332045 is a deficient number, since it is larger than the sum of its proper divisors (965314653).

1216332045 is an frugal number, since it uses more digits than its factorization.

1216332045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3483 (or 1741 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 1216332045 is about 34875.9522450642. The cubic root of 1216332045 is about 1067.4578029965.

Adding to 1216332045 its reverse (5402336121), we get a palindrome (6618668166).

The spelling of 1216332045 in words is "one billion, two hundred sixteen million, three hundred thirty-two thousand, forty-five".