18953619847 has 2 divisors, whose sum is σ = 18953619848. Its totient is φ = 18953619846.

The previous prime is 18953619799. The next prime is 18953619859. The reversal of 18953619847 is 74891635981.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18953619847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18953619647) 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, 9476809923 + 9476809924.

It is an arithmetic number, because the mean of its divisors is an integer number (9476809924).

Almost surely, 2^18953619847 is an apocalyptic number.

18953619847 is a deficient number, since it is larger than the sum of its proper divisors (1).

18953619847 is an equidigital number, since it uses as much as digits as its factorization.

18953619847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13063680, while the sum is 61.

The spelling of 18953619847 in words is "eighteen billion, nine hundred fifty-three million, six hundred nineteen thousand, eight hundred forty-seven".