18984345847 has 2 divisors, whose sum is σ = 18984345848. Its totient is φ = 18984345846.

The previous prime is 18984345841. The next prime is 18984345883. The reversal of 18984345847 is 74854348981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18984345847 - 2³ = 18984345839 is a prime.

It is a super-2 number, since 2×18984345847² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18984345841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492172923 + 9492172924.

It is an arithmetic number, because the mean of its divisors is an integer number (9492172924).

Almost surely, 2^18984345847 is an apocalyptic number.

18984345847 is a deficient number, since it is larger than the sum of its proper divisors (1).

18984345847 is an equidigital number, since it uses as much as digits as its factorization.

18984345847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30965760, while the sum is 61.

The spelling of 18984345847 in words is "eighteen billion, nine hundred eighty-four million, three hundred forty-five thousand, eight hundred forty-seven".