1216111064 has 64 divisors (see below), whose sum is σ = 2634508800. Its totient is φ = 515520000.

The previous prime is 1216111033. The next prime is 1216111081. The reversal of 1216111064 is 4601116121.

It is a happy number.

It is a super-2 number, since 2×1216111064² = 2957852239966424192, which contains 22 as substring.

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, 3387317 + ... + 3387675.

It is an arithmetic number, because the mean of its divisors is an integer number (41164200).

Almost surely, 2^1216111064 is an apocalyptic number.

1216111064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1216111064 is an abundant number, since it is smaller than the sum of its proper divisors (1418397736).

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

1216111064 is a wasteful number, since it uses less digits than its factorization.

1216111064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 1216111064 is about 34872.7840012810. The cubic root of 1216111064 is about 1067.3931544820.

Adding to 1216111064 its reverse (4601116121), we get a palindrome (5817227185).

The spelling of 1216111064 in words is "one billion, two hundred sixteen million, one hundred eleven thousand, sixty-four".