18974531663 has 2 divisors, whose sum is σ = 18974531664. Its totient is φ = 18974531662.

The previous prime is 18974531591. The next prime is 18974531687. The reversal of 18974531663 is 36613547981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18974531663 - 2¹² = 18974527567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974536663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9487265831 + 9487265832.

It is an arithmetic number, because the mean of its divisors is an integer number (9487265832).

Almost surely, 2^18974531663 is an apocalyptic number.

18974531663 is a deficient number, since it is larger than the sum of its proper divisors (1).

18974531663 is an equidigital number, since it uses as much as digits as its factorization.

18974531663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 53.

The spelling of 18974531663 in words is "eighteen billion, nine hundred seventy-four million, five hundred thirty-one thousand, six hundred sixty-three".