1216611036 has 96 divisors (see below), whose sum is σ = 3300756480. Its totient is φ = 386793792.

The previous prime is 1216611007. The next prime is 1216611037. The reversal of 1216611036 is 6301166121.

1216611036 is a `hidden beast` number, since 1 + 2 + 16 + 611 + 0 + 36 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216611037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1606770 + ... + 1607526.

It is an arithmetic number, because the mean of its divisors is an integer number (34382880).

Almost surely, 2^1216611036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1216611036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1650378240).

1216611036 is an abundant number, since it is smaller than the sum of its proper divisors (2084145444).

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

1216611036 is a wasteful number, since it uses less digits than its factorization.

1216611036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440 (or 1432 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 1216611036 is about 34879.9517774896. The cubic root of 1216611036 is about 1067.5394112915.

Adding to 1216611036 its reverse (6301166121), we get a palindrome (7517777157).

The spelling of 1216611036 in words is "one billion, two hundred sixteen million, six hundred eleven thousand, thirty-six".