1216634105279 has 2 divisors, whose sum is σ = 1216634105280. Its totient is φ = 1216634105278.

The previous prime is 1216634105257. The next prime is 1216634105321. The reversal of 1216634105279 is 9725014366121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216634105279 - 2²⁰ = 1216633056703 is a prime.

It is a super-2 number, since 2×1216634105279² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216634105579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608317052639 + 608317052640.

It is an arithmetic number, because the mean of its divisors is an integer number (608317052640).

Almost surely, 2^{1216634105279} is an apocalyptic number.

1216634105279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216634105279 is an equidigital number, since it uses as much as digits as its factorization.

1216634105279 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 1216634105279 in words is "one trillion, two hundred sixteen billion, six hundred thirty-four million, one hundred five thousand, two hundred seventy-nine".