18703909447 has 2 divisors, whose sum is σ = 18703909448. Its totient is φ = 18703909446.

The previous prime is 18703909429. The next prime is 18703909457. The reversal of 18703909447 is 74490930781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18703909447 - 2¹⁵ = 18703876679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18703909394 and 18703909403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18703909457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9351954723 + 9351954724.

It is an arithmetic number, because the mean of its divisors is an integer number (9351954724).

Almost surely, 2^18703909447 is an apocalyptic number.

18703909447 is a deficient number, since it is larger than the sum of its proper divisors (1).

18703909447 is an equidigital number, since it uses as much as digits as its factorization.

18703909447 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 18703909447 in words is "eighteen billion, seven hundred three million, nine hundred nine thousand, four hundred forty-seven".