18660542671 has 2 divisors, whose sum is σ = 18660542672. Its totient is φ = 18660542670.

The previous prime is 18660542669. The next prime is 18660542707. The reversal of 18660542671 is 17624506681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18660542671 - 2¹ = 18660542669 is a prime.

Together with 18660542669, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18660542071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9330271335 + 9330271336.

It is an arithmetic number, because the mean of its divisors is an integer number (9330271336).

Almost surely, 2^18660542671 is an apocalyptic number.

18660542671 is a deficient number, since it is larger than the sum of its proper divisors (1).

18660542671 is an equidigital number, since it uses as much as digits as its factorization.

18660542671 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 46.

The spelling of 18660542671 in words is "eighteen billion, six hundred sixty million, five hundred forty-two thousand, six hundred seventy-one".