1216311634265 has 64 divisors (see below), whose sum is σ = 1806714201600. Its totient is φ = 765471651840.

The previous prime is 1216311634229. The next prime is 1216311634283. The reversal of 1216311634265 is 5624361136121.

It is not a de Polignac number, because 1216311634265 - 2¹⁸ = 1216311372121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 105311711 + ... + 105323259.

It is an arithmetic number, because the mean of its divisors is an integer number (28229909400).

Almost surely, 2^{1216311634265} is an apocalyptic number.

It is an amenable number.

1216311634265 is a deficient number, since it is larger than the sum of its proper divisors (590402567335).

1216311634265 is a wasteful number, since it uses less digits than its factorization.

1216311634265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12882.

The product of its digits is 155520, while the sum is 41.

The spelling of 1216311634265 in words is "one trillion, two hundred sixteen billion, three hundred eleven million, six hundred thirty-four thousand, two hundred sixty-five".