18418020427 has 2 divisors, whose sum is σ = 18418020428. Its totient is φ = 18418020426.

The previous prime is 18418020419. The next prime is 18418020479. The reversal of 18418020427 is 72402081481.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18418020427 - 2³ = 18418020419 is a prime.

It is not a weakly prime, because it can be changed into another prime (18418020497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209010213 + 9209010214.

It is an arithmetic number, because the mean of its divisors is an integer number (9209010214).

Almost surely, 2^18418020427 is an apocalyptic number.

18418020427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418020427 is an equidigital number, since it uses as much as digits as its factorization.

18418020427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28672, while the sum is 37.

The spelling of 18418020427 in words is "eighteen billion, four hundred eighteen million, twenty thousand, four hundred twenty-seven".