11553616643 has 2 divisors, whose sum is σ = 11553616644. Its totient is φ = 11553616642.

The previous prime is 11553616639. The next prime is 11553616661. The reversal of 11553616643 is 34661635511.

It is a weak prime.

It is an emirp because it is prime and its reverse (34661635511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11553616643 - 2² = 11553616639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11553616643.

It is not a weakly prime, because it can be changed into another prime (11553616693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5776808321 + 5776808322.

It is an arithmetic number, because the mean of its divisors is an integer number (5776808322).

Almost surely, 2^11553616643 is an apocalyptic number.

11553616643 is a deficient number, since it is larger than the sum of its proper divisors (1).

11553616643 is an equidigital number, since it uses as much as digits as its factorization.

11553616643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 41.

The spelling of 11553616643 in words is "eleven billion, five hundred fifty-three million, six hundred sixteen thousand, six hundred forty-three".