18894661403 has 2 divisors, whose sum is σ = 18894661404. Its totient is φ = 18894661402.

The previous prime is 18894661381. The next prime is 18894661427. The reversal of 18894661403 is 30416649881.

It is a weak prime.

It is an emirp because it is prime and its reverse (30416649881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18894661403 - 2¹⁸ = 18894399259 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18894661453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9447330701 + 9447330702.

It is an arithmetic number, because the mean of its divisors is an integer number (9447330702).

Almost surely, 2^18894661403 is an apocalyptic number.

18894661403 is a deficient number, since it is larger than the sum of its proper divisors (1).

18894661403 is an equidigital number, since it uses as much as digits as its factorization.

18894661403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The spelling of 18894661403 in words is "eighteen billion, eight hundred ninety-four million, six hundred sixty-one thousand, four hundred three".