18781808347 has 2 divisors, whose sum is σ = 18781808348. Its totient is φ = 18781808346.

The previous prime is 18781808341. The next prime is 18781808401. The reversal of 18781808347 is 74380818781.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18781808347 - 2²³ = 18773419739 is a prime.

It is not a weakly prime, because it can be changed into another prime (18781808341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9390904173 + 9390904174.

It is an arithmetic number, because the mean of its divisors is an integer number (9390904174).

Almost surely, 2^18781808347 is an apocalyptic number.

18781808347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18781808347 is an equidigital number, since it uses as much as digits as its factorization.

18781808347 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2408448, while the sum is 55.

The spelling of 18781808347 in words is "eighteen billion, seven hundred eighty-one million, eight hundred eight thousand, three hundred forty-seven".