18814068491 has 2 divisors, whose sum is σ = 18814068492. Its totient is φ = 18814068490.

The previous prime is 18814068473. The next prime is 18814068499. The reversal of 18814068491 is 19486041881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18814068491 is a prime.

It is not a weakly prime, because it can be changed into another prime (18814068499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407034245 + 9407034246.

It is an arithmetic number, because the mean of its divisors is an integer number (9407034246).

Almost surely, 2^18814068491 is an apocalyptic number.

18814068491 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814068491 is an equidigital number, since it uses as much as digits as its factorization.

18814068491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 442368, while the sum is 50.

The spelling of 18814068491 in words is "eighteen billion, eight hundred fourteen million, sixty-eight thousand, four hundred ninety-one".