16557542671 has 2 divisors, whose sum is σ = 16557542672. Its totient is φ = 16557542670.

The previous prime is 16557542641. The next prime is 16557542689. The reversal of 16557542671 is 17624575561.

It is a strong prime.

It is an emirp because it is prime and its reverse (17624575561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16557542671 - 2⁷ = 16557542543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16557542641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278771335 + 8278771336.

It is an arithmetic number, because the mean of its divisors is an integer number (8278771336).

Almost surely, 2^16557542671 is an apocalyptic number.

16557542671 is a deficient number, since it is larger than the sum of its proper divisors (1).

16557542671 is an equidigital number, since it uses as much as digits as its factorization.

16557542671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1764000, while the sum is 49.

The spelling of 16557542671 in words is "sixteen billion, five hundred fifty-seven million, five hundred forty-two thousand, six hundred seventy-one".