1216202635643 has 2 divisors, whose sum is σ = 1216202635644. Its totient is φ = 1216202635642.

The previous prime is 1216202635631. The next prime is 1216202635693. The reversal of 1216202635643 is 3465362026121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1216202635643 - 2⁶ = 1216202635579 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216202635643.

It is not a weakly prime, because it can be changed into another prime (1216202635693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608101317821 + 608101317822.

It is an arithmetic number, because the mean of its divisors is an integer number (608101317822).

Almost surely, 2^{1216202635643} is an apocalyptic number.

1216202635643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216202635643 is an equidigital number, since it uses as much as digits as its factorization.

1216202635643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 41.

The spelling of 1216202635643 in words is "one trillion, two hundred sixteen billion, two hundred two million, six hundred thirty-five thousand, six hundred forty-three".