18889269247 has 2 divisors, whose sum is σ = 18889269248. Its totient is φ = 18889269246.

The previous prime is 18889269227. The next prime is 18889269251. The reversal of 18889269247 is 74296298881.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18889269247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18889269227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9444634623 + 9444634624.

It is an arithmetic number, because the mean of its divisors is an integer number (9444634624).

Almost surely, 2^18889269247 is an apocalyptic number.

18889269247 is a deficient number, since it is larger than the sum of its proper divisors (1).

18889269247 is an equidigital number, since it uses as much as digits as its factorization.

18889269247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27869184, while the sum is 64.

The spelling of 18889269247 in words is "eighteen billion, eight hundred eighty-nine million, two hundred sixty-nine thousand, two hundred forty-seven".