1216638756411 has 32 divisors (see below), whose sum is σ = 1756554842112. Its totient is φ = 744594301440.

The previous prime is 1216638756397. The next prime is 1216638756433. The reversal of 1216638756411 is 1146578366121.

It is not a de Polignac number, because 1216638756411 - 2⁵ = 1216638756379 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216638752411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33375651 + ... + 33412083.

It is an arithmetic number, because the mean of its divisors is an integer number (54892338816).

Almost surely, 2^{1216638756411} is an apocalyptic number.

1216638756411 is a deficient number, since it is larger than the sum of its proper divisors (539916085701).

1216638756411 is a wasteful number, since it uses less digits than its factorization.

1216638756411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41123.

The product of its digits is 1451520, while the sum is 51.

The spelling of 1216638756411 in words is "one trillion, two hundred sixteen billion, six hundred thirty-eight million, seven hundred fifty-six thousand, four hundred eleven".