18157072243 has 2 divisors, whose sum is σ = 18157072244. Its totient is φ = 18157072242.

The previous prime is 18157072237. The next prime is 18157072247. The reversal of 18157072243 is 34227075181.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18157072243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18157072196 and 18157072205.

It is not a weakly prime, because it can be changed into another prime (18157072247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9078536121 + 9078536122.

It is an arithmetic number, because the mean of its divisors is an integer number (9078536122).

Almost surely, 2^18157072243 is an apocalyptic number.

18157072243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18157072243 is an equidigital number, since it uses as much as digits as its factorization.

18157072243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 18157072243 in words is "eighteen billion, one hundred fifty-seven million, seventy-two thousand, two hundred forty-three".