18954393427 has 2 divisors, whose sum is σ = 18954393428. Its totient is φ = 18954393426.

The previous prime is 18954393413. The next prime is 18954393443. The reversal of 18954393427 is 72439345981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18954393427 is a prime.

It is not a weakly prime, because it can be changed into another prime (18954393527) 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, 9477196713 + 9477196714.

It is an arithmetic number, because the mean of its divisors is an integer number (9477196714).

Almost surely, 2^18954393427 is an apocalyptic number.

18954393427 is a deficient number, since it is larger than the sum of its proper divisors (1).

18954393427 is an equidigital number, since it uses as much as digits as its factorization.

18954393427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6531840, while the sum is 55.

The spelling of 18954393427 in words is "eighteen billion, nine hundred fifty-four million, three hundred ninety-three thousand, four hundred twenty-seven".