16554543666523 has 2 divisors, whose sum is σ = 16554543666524. Its totient is φ = 16554543666522.

The previous prime is 16554543666517. The next prime is 16554543666547. The reversal of 16554543666523 is 32566634545561.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16554543666523 is a prime.

It is not a weakly prime, because it can be changed into another prime (16554543666503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8277271833261 + 8277271833262.

It is an arithmetic number, because the mean of its divisors is an integer number (8277271833262).

Almost surely, 2^{16554543666523} is an apocalyptic number.

16554543666523 is a deficient number, since it is larger than the sum of its proper divisors (1).

16554543666523 is an equidigital number, since it uses as much as digits as its factorization.

16554543666523 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280000, while the sum is 61.

The spelling of 16554543666523 in words is "sixteen trillion, five hundred fifty-four billion, five hundred forty-three million, six hundred sixty-six thousand, five hundred twenty-three".