1216122653563 has 8 divisors (see below), whose sum is σ = 1269552480768. Its totient is φ = 1162739070504.

The previous prime is 1216122653561. The next prime is 1216122653567. The reversal of 1216122653563 is 3653562216121.

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 1216122653563 - 2¹ = 1216122653561 is a prime.

It is a super-2 number, since 2×1216122653563² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1216122653561) 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, 11507281 + ... + 11612482.

It is an arithmetic number, because the mean of its divisors is an integer number (158694060096).

Almost surely, 2^{1216122653563} is an apocalyptic number.

1216122653563 is a deficient number, since it is larger than the sum of its proper divisors (53429827205).

1216122653563 is a wasteful number, since it uses less digits than its factorization.

1216122653563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23122073.

The product of its digits is 388800, while the sum is 43.

Adding to 1216122653563 its reverse (3653562216121), we get a palindrome (4869684869684).

The spelling of 1216122653563 in words is "one trillion, two hundred sixteen billion, one hundred twenty-two million, six hundred fifty-three thousand, five hundred sixty-three".