1216634105305 has 8 divisors (see below), whose sum is σ = 1459980300744. Its totient is φ = 973294368000.

The previous prime is 1216634105279. The next prime is 1216634105321. The reversal of 1216634105305 is 5035014366121.

It can be written as a sum of positive squares in 4 ways, for example, as 132697004176 + 1083937101129 = 364276^2 + 1041123^2 .

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

It is not a de Polignac number, because 1216634105305 - 2¹¹ = 1216634103257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1189926 + ... + 1961935.

It is an arithmetic number, because the mean of its divisors is an integer number (182497537593).

Almost surely, 2^{1216634105305} is an apocalyptic number.

It is an amenable number.

1216634105305 is a deficient number, since it is larger than the sum of its proper divisors (243346195439).

1216634105305 is an equidigital number, since it uses as much as digits as its factorization.

1216634105305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229067.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 1216634105305 in words is "one trillion, two hundred sixteen billion, six hundred thirty-four million, one hundred five thousand, three hundred five".