1216610705 has 8 divisors (see below), whose sum is σ = 1470436800. Its totient is φ = 966285936.

The previous prime is 1216610701. The next prime is 1216610713. The reversal of 1216610705 is 5070166121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1216610705 - 2² = 1216610701 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216610701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 874565 + ... + 875954.

It is an arithmetic number, because the mean of its divisors is an integer number (183804600).

Almost surely, 2^1216610705 is an apocalyptic number.

It is an amenable number.

1216610705 is a deficient number, since it is larger than the sum of its proper divisors (253826095).

1216610705 is a wasteful number, since it uses less digits than its factorization.

1216610705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750663.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 1216610705 is about 34879.9470326433. The cubic root of 1216610705 is about 1067.5393144773.

Adding to 1216610705 its reverse (5070166121), we get a palindrome (6286776826).

The spelling of 1216610705 in words is "one billion, two hundred sixteen million, six hundred ten thousand, seven hundred five".