1216045644053 has 4 divisors (see below), whose sum is σ = 1287577740780. Its totient is φ = 1144513547328.

The previous prime is 1216045644031. The next prime is 1216045644091. The reversal of 1216045644053 is 3504465406121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 393973394929 + 822072249124 = 627673^2 + 906682^2 .

It is a cyclic number.

It is not a de Polignac number, because 1216045644053 - 2¹⁸ = 1216045381909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216045644053.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216045634053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35766048338 + ... + 35766048371.

It is an arithmetic number, because the mean of its divisors is an integer number (321894435195).

Almost surely, 2^{1216045644053} is an apocalyptic number.

It is an amenable number.

1216045644053 is a deficient number, since it is larger than the sum of its proper divisors (71532096727).

1216045644053 is an equidigital number, since it uses as much as digits as its factorization.

1216045644053 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71532096726.

The product of its (nonzero) digits is 345600, while the sum is 41.

The spelling of 1216045644053 in words is "one trillion, two hundred sixteen billion, forty-five million, six hundred forty-four thousand, fifty-three".