18109757947 has 2 divisors, whose sum is σ = 18109757948. Its totient is φ = 18109757946.

The previous prime is 18109757921. The next prime is 18109757969. The reversal of 18109757947 is 74975790181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18109757947 - 2⁷ = 18109757819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18109757891 and 18109757900.

It is not a weakly prime, because it can be changed into another prime (18109757987) 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, 9054878973 + 9054878974.

It is an arithmetic number, because the mean of its divisors is an integer number (9054878974).

Almost surely, 2^18109757947 is an apocalyptic number.

18109757947 is a deficient number, since it is larger than the sum of its proper divisors (1).

18109757947 is an equidigital number, since it uses as much as digits as its factorization.

18109757947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4445280, while the sum is 58.

The spelling of 18109757947 in words is "eighteen billion, one hundred nine million, seven hundred fifty-seven thousand, nine hundred forty-seven".