18049474747 has 2 divisors, whose sum is σ = 18049474748. Its totient is φ = 18049474746.

The previous prime is 18049474727. The next prime is 18049474777. The reversal of 18049474747 is 74747494081.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18049474747 is a prime.

It is not a weakly prime, because it can be changed into another prime (18049474727) 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, 9024737373 + 9024737374.

It is an arithmetic number, because the mean of its divisors is an integer number (9024737374).

Almost surely, 2^18049474747 is an apocalyptic number.

18049474747 is a deficient number, since it is larger than the sum of its proper divisors (1).

18049474747 is an equidigital number, since it uses as much as digits as its factorization.

18049474747 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6322176, while the sum is 55.

The spelling of 18049474747 in words is "eighteen billion, forty-nine million, four hundred seventy-four thousand, seven hundred forty-seven".