16557542543 has 2 divisors, whose sum is σ = 16557542544. Its totient is φ = 16557542542.

The previous prime is 16557542537. The next prime is 16557542557. The reversal of 16557542543 is 34524575561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16557542543 - 2⁴ = 16557542527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16557542563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278771271 + 8278771272.

It is an arithmetic number, because the mean of its divisors is an integer number (8278771272).

Almost surely, 2^16557542543 is an apocalyptic number.

16557542543 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557542543 is an equidigital number, since it uses as much as digits as its factorization.

16557542543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520000, while the sum is 47.

The spelling of 16557542543 in words is "sixteen billion, five hundred fifty-seven million, five hundred forty-two thousand, five hundred forty-three".