18743387563 has 2 divisors, whose sum is σ = 18743387564. Its totient is φ = 18743387562.

The previous prime is 18743387437. The next prime is 18743387599. The reversal of 18743387563 is 36578334781.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18743387563 - 2¹⁷ = 18743256491 is a prime.

It is not a weakly prime, because it can be changed into another prime (18743387063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9371693781 + 9371693782.

It is an arithmetic number, because the mean of its divisors is an integer number (9371693782).

Almost surely, 2^18743387563 is an apocalyptic number.

18743387563 is a deficient number, since it is larger than the sum of its proper divisors (1).

18743387563 is an equidigital number, since it uses as much as digits as its factorization.

18743387563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10160640, while the sum is 55.

The spelling of 18743387563 in words is "eighteen billion, seven hundred forty-three million, three hundred eighty-seven thousand, five hundred sixty-three".