18915368347 has 2 divisors, whose sum is σ = 18915368348. Its totient is φ = 18915368346.

The previous prime is 18915368279. The next prime is 18915368399. The reversal of 18915368347 is 74386351981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18915368347 - 2¹⁹ = 18914844059 is a prime.

It is not a weakly prime, because it can be changed into another prime (18915368047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9457684173 + 9457684174.

It is an arithmetic number, because the mean of its divisors is an integer number (9457684174).

Almost surely, 2^18915368347 is an apocalyptic number.

18915368347 is a deficient number, since it is larger than the sum of its proper divisors (1).

18915368347 is an equidigital number, since it uses as much as digits as its factorization.

18915368347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The spelling of 18915368347 in words is "eighteen billion, nine hundred fifteen million, three hundred sixty-eight thousand, three hundred forty-seven".